Hi! I'm a 19 year old female. I believe that I have some kind of anxiety disorder but haven't got diagnosed yet. But I'm always anxious and have had a few panic attacks within the last 3 months! Anyways, I've just recently started having heart palpitations where it's a really hard heart beat and I can feel it in my lower neck! Usually it's once or twice a day but lately it's been a lot more. My chest gets really tight after and my heart hurts and starts racing and my left arm feels weird. Is this just anxiety? Or is it more serious???? I'm crazy anxious and at college so I don't know what to do.