It is really annoying, and really strange. I go through periods where I don't eat, but never feel hungry either. I don't have any energy and I can't really think straight, like my brain is foggy. Then suddenly I'll seem fine, I'll get really excited about something and have no idea why I've been feeling so down. Then it creeps back in and I just feel like I'm in some awful funk and want to cry all the time. I hate it.