I'm doing the same with Portfolio (singing group). I've already begged off working at Oxfam this Saturday because I'm busy this weekend, so it'd be a bit awkward to ask Oxfam if they mind me missing another couple of weeks as well, but I may still have to -- I'll see how I feel. (I'm keeping up with orchestra because it'll be harder to go back if I miss too many rehearsals.)
Why am I doing all this?
More and more I feel as though the only thing that's keeping me going is momentum; I feel as though somebody's pushed me down a steep slope and I'm running -- well, tripping over my own feet in a vaguely forwards direction -- because otherwise I'd fall flat on my face. I need to stop, somehow, and work out what the hell I'm doing with my life. I need to make deliberate and considered choices to do the things that I want to do, rather than just carrying on mindlessly with everything that I'm already doing.
I know I can get the momentum back again if I want to for things that are worth it; now it's just a question of deciding what's worth it.