The only really committed artist is he who, without refusing to take part in the combat, at least refuses to join the regular armies and remains a freelance.
I've battled with that type of stuff, but what I've found is that by doing stand-up, I've actually learned about depression and how to combat it. I don't have clinical, but I've definitely had my bouts with it.
I take Sudafed to combat my congestion, so I always carry some with me because I like to be prepared and make sure I'm ready whenever symptoms strike. It's also a really good idea to figure out what your triggers are.