Try grounding yourself with progressive muscle relaxation. Go through your body from your toes up and clench each muscle as hard as you can twice. The second time picture the muscles going completely limp. Focus all your energy on relaxing those muscles and releasing all the tension into the world. It will help you calm down so you can deal with whatever it is you're going through. I'm sorry you are having a rough time. Please go to the ER if you need to.