Hi, I am a 20 year old female. I had a pounding sensation in my chest and a feeling that I have to take deeper breaths every time I inhale. My left arm feels funny too. This is the first time I've experienced this and I'm really worried that this is a heart attack. I don't drink or smoke, and my blood pressure is normal. No family history but my dad has high blood pressure. Really worried now, is it likely that I'm having a heart attack?