So sorry to hear that you're feeling that way. I know how you feel. There are days when I literally cannot get out of bed because depression sucked all the energy out of me.
Like you, I've also been on Wellbutrin (and a bunch of other medications) which worked for a while until my body got use to it.
One thing , though, that has help me get out of my funk is exercising. It doesn't has to be anything strenuous. It can just be a short walk outdoors. I know it's hard, esp. when you don't have the energy and feel bummed out, but it really does help clear your head.
Keeping a journal and writing out your thoughts and positive things (and positive affirmations) that you want to accomplish also helps.