Fundamentally what's keeping me going is that I see a big market opportunity. But on a day-to-day basis, when I really hit a brick wall, I take a break. I hav

Fundamentally what's keeping me going is that I see a big market opportunity. But on a day-to-day basis, when I really hit a brick wall, I take a break. I have a "small items to-do list". It's a list of things that individually would take a short amount of time (say 5min - 3hrs) that I'd like to do "some day". I do one. Or two. Or 10. This clears my mind and also makes me feel productive. Also, it's a good break so that when I do get back to the big thing I'm chasing, I come back with a clear mind and fresh eyes so that I figure out a way around the brick wall. Exercise, cooking, watching TV, and other activities also help. Just do what you feel like doing to re-group and re-energize, and then get back at it.