That is how it feels for me too.
I work all day with first, second, and third graders...so I MUST focus on them. From the time I get in my car after work until I go to bed all I do is cry, I dont always know why I am crying,,, I am working with my doctor on an antidepressant called Pristiq it seems to help some, we are adjusting the dosages.
Never worry, what I am reading, are normal reactions. In your down time, think about positive things, not about things that already cause you stresss. put on a CD from a band you like (or a praise and worship CD).
It is SOOOOOOO easy to focus on the nasty junk that you should make it a point to focus on the positive parts of what is going on. Accentuate the positive....focus on the positive....look at life outside the box
YOU CAN DO THIS!!!