can’t breathe.

I don’t really know what this feeling is, I think it’s anxiety but there’s no trigger for it. I will be sitting in class and suddenly for no reason I feel incredibly nervous. I can’t breathe,I feel naseous and can’t sit still. It’s like a tingling through my whole body. Or I will be sitting on Facebook and suddenly I feel disgusting. What is wrong with me? All I want to do is cry but I never can. I can’t tell anyone because they don’t understand. God I am so fucking sick of everyone, of not being listened to let alone understood.