I feel ya!
I see this thread is a few months old, and I hope you are feeling better now...
I know this feeling, I worked furiously when I first started out.. after 3 months though, I started to slack off, I am not sure why..
then I felt guilty about slacking off, and that led to depression and im taking antidepressants on and off (sounds so cheerful)
Its funny how i feel better when I am productive, but I am not productive unless I feel better! You have to force your way into this circle.. antideps have helped me get out of the rut long enough to be slightly productive, which in turn motivates me to keep going..
I am writing my literature review for a few months, but am painfully overdue.. tools like mytomatoes are very helpful.. I usually give myself a very big reward if I stick with it for 25 min :)
Still deciding what to give myself if I stick to this for the next three years 8-)