OK, just going on the word unravel and, assuming, it means having something emotional happen I got the following.
Tower, Ship, Child
Key, Book, Birds
Sun, Fish, Rider
Do you have a child, work with children, or involved in some way with someone who could be considered childish or child-like?
The Tower I am going to say is work related for you so going with the columns first I am going to say that there is something happening at work that is being kept under wraps but you know about it and feel the need to be open about it, to shine a light on it, as it were.
The Ship, Book, Fish cards are suggesting that during your travels home you reflect on what you know and might be concerned about your security if this hidden knowledge were to come out.
Child, Birds, Rider are telling me that there is a person who is being childish/immature and possibly spreading lies/rumors and those lies/rumors could start to affect others as they "get around" at work.
Rows -
Tower, Ship, Child - again, on your travels home from work you are thinking about this person and what they are doing.
Key, Book, Birds -
You could take what you know and go to someone in a position of authority, and let them know what is going on. You could advise them of what is being said by this person.
Sun, Fish, Rider -
If you choose to shed light on this situation be careful not to be too overly confident. Don't get cocky about being the one to blow the whistle because it could backfire if you let your ego take over. Remember the saying about shooting the messenger. Sometimes the person who delivers the news is the one to blame.
OK, so with the cards I got and the over all theme of the cards (provided I am reading the situation correctly) I would say that the "unraveling" that you do on your way home is caused by stress over something that is happening at work that you have knowledge about and don't really know what to do or how to deal with this knowledge/situation.
While the Key card is not the central card, I am drawn to it and to advise you that you really do know, deep down, what to do about the situation.