It became esp. detrimental as I entered my teenage years. I practically escaped from 'real life' altogether via the computer. It's something I continue to struggle with, although I had dropped someone who was a major factor in my escapism.
I'll say... Late 2001. During winter break. Mid-December 2001.
It was wasted on a particular website, where I picked up two 'close' online friends for 4 or 5 years.
My recent stalker came off this site around 2004-05, also. For now, he's the 'icon' for my Venus/Pluto in Scorpio, 7th House, on the Descendant. I worried about what sort of person this signification would bring into my life, and it's been validated.
It's a chapter of my life I'm struggling to close, internally, and evidently, externally.
I'm examining a period where you are leaving childhood behind and entering adolescence. I don't think Valens used Zodiacal Releasing for examining childhood but I think that the period you've focused on is hopefully readable.
I'll start with profections for the times mentioned and then move on to have a look at Zodiacal Releasing.
Profections from Ascendant
December 2001 was in your thirteenth year, so by profection everything returns to it's original position (on your twelfth birthday). This makes Venus Lord of the year. As well as ruling your Ascendant, Venus also rules your sixth House of Libra. The focus is on you, your body, mind and Spirit and also possibly ill health.
I'd say the problems began at the start of the month, as Venus moves into your eighth House (though they might not have become apparent at first). The first of December was a Sagittarius day and marked the entry of Venus into Sagittarius, your eighth sign. On 25 December (the middle of the month) you entered a Leo month focusing attention on your fourth house, of home and the opposite house to the tenth of Action. This is the month of a 'Me' year in which you withdrew into yourself.
Profections from the Descendant
December 2001 is in a Scorpio year. The activation of Scorpio also creates an activation for it's ruler, Mars, and the natal planets in Scorpio (Venus) and also the Lot of Fortune which lies in the Sign. Valens sees profections from the Descendant as indicating change and trouble and profections from the Lot of Fortune indicating good fortune and success. Mars is began the year transiting your ninth House of Dreams and quickly transiting your natal Saturn (ruler of your ninth and tenth). On the ninth of December Mars entered your eleventh House focusing attention on friends and hopes. This was the time you began to make new friends via the Internet.
Profections from the Moon
Profections from the Moon give some indication about your health. Your natal Moon is in Pisces, your eleventh house. Your health will be in some way or other influenced by your friendships - as the natal position is above the horizon, this influence is likely to be felt at a spiritual or soul level during the year (this being a 'first house' year, re-emphasising your natal position). The profected month beginning 15th December is a Gemini month, relating your spiritual health to your physical possessions (such as a computer). Saturn is transiting Gemini and Mars is transiting Pisces, so both relevant houses contain malefics. Mars is already active in the issues of trouble and change. Transiting Saturn was opposed by Transiting Venus (a few days earlier). Transiting Venus is now opposing your transiting Lot of Nemesis, in Gemini (15 minutes separation). Nemesis, to quote Crane is
'Saturnine and thoroughly wretched: hidden negative factors, weakness ("impotence#2), exile, loss abd death'
Nemisis is in many ways unavoidable, it is an area of life over which you have no control and ends up often controlling you in a negative way. Your natal Lot of Nemesis lies just inside Cancer - your third House and a house often associated with communications and indeed computers (though I prefer the ninth for the latter)
So during that month beginning in mid December there are signs that your health and well being is threatened and that the threat is related to your possessions (The second house of Gemini is ruled by Mercury, itself the natural significator of computers and communications). As natal Moon is in Pisces it is ruled by Jupiter and in mid December, Jupiter was transiting your third house (often associated with communications) and not only completing your first Jupiter Return but re-awakening the natal Jupiter/Saturn opposition. A Day after the month began the transiting Moon also emphasised the same opposition.
The above shows that there were indicators of spiritual problems during the month but these do not account for a prolonged period (unless we associate them with the Jupiter return, which I think is stretching the connection). So I will also look at the Zodiacal Releasing periods
Zodiacal Releasing from Fortune
The problem with ZR here is that you were so young that you were still in your first ZR period (in fact one that lasted till 2004). As stated earlier, Valens warns against applying this method to childhood. But for the sake of this analysis I'll do that as coming up to teenage years might be argued to be an indication of leaving childhood behind. 2001 was a Level 2 Cancer year (emphasising your third House). Early December 2001 saw the start of a Cancer Level 3 and 4 period focusing everything on your third house, which as we have already seen emphasises the Moon and your health (and the Lot of Nemesis). I think the coincidence of the Time Lord period and the profections probably account for why this month set a behaviour pattern which persisted beyond the profected year. This December period was marked by a Loosing of the Bond, so it seemed to be particularly important.
The major period ended in June 2004 and you entered a Sagittarus period, which is still continuing and will end in April 2016. Although Sagittarius is your eighth House and therefore carries negative indications, it would be a mistake to classify the whole period as negative - there will be good times during the period but the influence of your eighth plance will linger in the background. Hellenisitic Astrologers labeled the eighth as 'Idle' an indication that it will not be easy to get things done or break patterns completely while this period is in force. Interestingly you describe this period as 'wasted' which is a good synonym for 'Idle' I stress 'easily' rather than simply an inability go get things done - the overall tendency is to inertia, and you have to work to break out. The worst of this period will have been from April 2004 to June 2005 - around the time you quoted above. At the beginning of that period Jupiter (ruler of your eighth) was transiting your fifth house and at that age, the outlet for fifth house activities is through play, games, exercise, relaxation and hobbies. I would hazard a guess that your used of websites had been established as your way of relaxing and 'enjoying' your self. - After this period other sign/houses begin to take effect on a more immediate level. I would guess that around December 2007 marked something of an improvement as Jupiter moved into your ninth house.
Currently you are in a Gemini L2 period, which began in January 2013 and this will continue till September next year, when your final L2 of this main period will being. It will be a Cancer period so there may be the final echoes of the period that began in 2004 through transits to Cancer and your natal Moon. However you won't have another Sagittarius main period, so these issues should die with it.
BTW did your recent stalker materialise around mid September last year?