I am a 28 year old healthy male that has bee having tightness in my chest, shortness of breath, I try to yawn but can't complete sometimes, I can take a deep breath and get some relief, I have been to the emergency room 3 times and they keep saying that I am having panic atttacks, but I have never had panic attacks, the 3rd time going to the ER they daignosed me with having allergic reaction vs panic attack, I just don't think that they are right, what do you think I have and what should I do?