Can somebody help me..

So I used to be a straight A student (with a few occasional B's, no biggie) and I used to stay up at night working on my school work for the next day or two or three. That's how crazy successful of a student I was. I don't know what's happening to me... I can't focus on my school work for anything! No, not just my school work... I can't read leisurely like I used to, I just can't focus on what I'm reading. I can't practice my violin for as long as I used to. I used to be able to stand there and play for almost an hour, and now I can barely do it for 10, 15 minutes tops. My grades at the moment are at an all time low, I have 2 D's, 3 C's, and 1 B. JENNIFER LYNN ELIZABETH WICKMAN! How the heck are you supposed to get into college? I dunno =\ Right now I have 6 classes worth of work to get done but I just CAN'T. You guys don't understand. I can't look at anything like I used to. What's wrong with me?! I can't sleep at night. My average time of falling asleep is around 5AM. If its any sooner I consider myself lucky. I have this kind of 'anxious' feeling all the time. It's weird. I'm falling apart at the seams and I don't even know what's going on!