off the top of my head, i can think of two possible paths:
1) you can effectively deal with this on your own. in this case, follow all the advice you get here about changes in routine, diet, exercise, social situations, philosophical outlook, etc. some of them will do the trick.
2) it is more serious then that and requires professional help. therapy can work wonders. it got me thru a tough year and when i was back on my feet i moved on. and, it was covered by my health insurance. hope that is the case for you.
either way, acknowledging the issue and declaring your desire to change are the first steps. good job. follow thu comes next. good luck.
i hope you can find a workable solution.