Freaking out about life and school!! What to do?!?

Okay, I don't know what else I should do. I am so overwhelmed right now. This past week, I have been doing school work, working, volunteering, sports, and studying myself crazy. Midterms for me are next week and I am so afraid of failing. When I study for things, I understand everything while I'm studying for it but when its time to take the actual test, I freak and don't remember anything!! And not only that, I'm a junior right now and I'm thinking about colleges and all and I'm not really sure what college I should go to. I have a few in mind but I don't know if I really want to go to them. And not only that, this year I'm doing terribly and my gpa dropped so much. There has been so many family problems arising and I can't deal with them all. I'm just too overwhelmed. I don't know who I can talk to anymore and I am not going to see a shrink or my idiotic school counselor. I'm just so overwhelmed. help please