During about the past year, I've been having awful mood swings. I've been telling myself that it's just because I'm a 16-year-old girl, but it had never been like this. There are inconsistant periods of time (anywhere from 5 days to a month) where i feel hyper and great and barely sleep because I don't want or need to. I feel great, singing to people and cheering them up. But then, without any warning, I completely crash. I sleep for upwards of 12 hours at a time and I just lay in bed being crushingly sad when I am awake. I'm always tired, and I've already gotten in trouble at school multiple times at school this year for falling asleep or not paying attention. My grades are going down, and I've always been an honor roll student. Should I be considering professional help or am I just psyching myself out?