I also have Mary K. Greer book Tarot For Your Self, I think it's a fantastic book! (and, no I also don't own any shares) In refference to your year card. For the Year Card Lessons she describes the Tower being as "Cleansing-bodywork, diet, fasting, housecleaning; anger and pain, tearing down or burning out old structures no longer necessary."
I personally think the Tower can be viewed as a positive change for the better, sure it will hurt like crazy, blood, sweat and tears as the expression goes. In the end you will be better off. Again always taking in consideration the cards surrounding the Tower and the mood or tone of the whole spread.
I wish you, Queen of Swords, the brightest blessings and Strength during this time.