As a result, I'm super familiar with that cold, dead, leaden feeling of not caring about anything, not really able to feel any of the excitement and buzz that I know, intellectually, I should be able to feel. It is taking a long old while to return back to a position of health, and while that's happening the only thing I've really had to draw on is grit, determination, and a sort of psychotic single mindedness.
I'm now in a much MUCH better place than I was before, but I've been able to keep pursuing my side project (and hopefully eventual startup), and able to keep making some kind of progress ... but it's really only been sheer bloody-mindedness that's kept me going. (I'm hella stubborn when I want to be).
Happily I'm feeling a lot better now, and progress is definitely picking up again now that I can actually smell the victory that's so tantalisingly close to being in my grasp.