How well I know. Even if you're barely managing, sometimes you have to do it by putting important tasks aside. At least, that's what I've been doing. And one unexpected event can send the whole house of cards crashing to the ground.
I know that some sororities can be enormously helpful, giving you emotional support and keeping you on track with schoolwork. But let me just cautiously suggest that sometimes now is not the best time to be involved in such an organization. Make sure it doesn't take away more than it gives you. If it's worth it, great. If not, you might want to give it a short break, if that won't completely dork up your living arrangements.
Hang in there, and vent all you like. Do you get a full week off for Thanksgiving?