Yea going really low calories and working out is really nasty - you visibly start shaking during practice and start feeling really strange - I'm guessing from lack of blood sugar. Will not be doing that in the future.

I'm trying something along those lines this month - I eat maintenance calories and work out over the week (~3000) and then I eat ~1000 on the weekend (mostly from coffe/milk/protein shake), but I want to do side projects on the weekend - sometimes I can get in the zone and food doesn't even get on my mind, other times I just feel like doing nothing when I haven't eaten.