Anxiety

Sometimes I just feel really shaky and nervous for no reason like I've forgotten to do something really important, but I can't remember what. I'm been feeling this for a while now. It initially started with some problems at school, not bullying, just completing assignments. I'd be so overwhelmed about the work, even if it was just something small, and I wouldn't be able to focus on what I was working on. Then, ultimately, I wouldn't finish or I just would do the assignment. This just made everything worse because then I'd be really really nervous when it came the time to hand in the homework. Like, nervous to the point where my heart was racing and I felt like I couldn't breath. Then I started having trouble sleeping because I kept thinking about all the things that I didn't do. So, on top of that, I was always tired and irritable, easily angered and annoyed. That continued over 3 years and I'm on my fourth. I'm a little better now, but I did get a C- in one of my classes because of this. This semester I'm determined to do better, and I am. The wonky problem, the feelings of constant anxiety lingers even though I'm not doing anything wrong. I'll suddenly be overcome with a feeling of foreboding or panic for absolutely no reason. The sleep problems and symptoms of fatigue are continuing and I even sometimes snap at my friends a lot more often. I'm not sure if I have any disorders or mental problems or learning disabilities and I don't want to go to someone because I don't want my parents knowing about it.