So I have this quite a lot but I only put my finger on it yesterday, I sometimes just feel so stressed/anxious for no particular reason and I feel like I'm just buzzing, in a bad way tho.
I feel like I could fight a bear or something, i want to punch something or run or anything. 
The only problem is that this usually happens when I'm in class so I really don't know how to deal with it there.
Yes, in theory i could leave the class for a bit, which i have done a few times but it doesn't really help because I can't get rid of the nervous energy.
When I stay in class, I get so agitated I end up scratching myself so I want to avoid that aswell.

Do any of you guys know how i could deal with this feeling?