Ok, I am pretty much a healthy 21 year old average sized (not obese or overweight) female. I have a moderate level of physical activity during the week and I have a pretty healthy diet. I am not a smoker, and I only drink occasionally, and never in large portions. A few months ago I noticed that I was getting short of breath at very random times, like when I was just sitting or when I was eating. I didn't pay much attention to it when it started, because a few deep breaths would usually take care of the problem. Well about a month ago, I was driving home from a 9 hour road trip, and the breathing trouble started. But this time, a few deep breaths DID NOT take care of the problem. Now, when I say "shortness of breath", I am not talking about a constricted airway. It just feels like no matter how hard I try to breath I just CAN'T fill my lung up with air! Like, I have to suck in as much air as humanly possible to "satisfy" the urge to breath. I decide to go to the emergency room. When I went to the ER, they said my chest XRay looked completely normal, and that I was probably just having a panic attack. I knew there was NO WAY I was having a panic attack, I had just gotten home from VACATION! Anyway, I left the ER with a prescription for XANAX.. Later that morning, my breathing never let up and finally I just collapsed. I was taken to another ER, where they discovered that my lung had collapsed for an unknown reason. A few weeks after I got out of the hospital, my symptoms persisted. I made an appointment with a pulminologist, and he came to the conclusion that it must be my esaphogus spasming. He gave me a prescription for Prevacid, and sent me on my way. Here we are a month later, and today my symptoms returned. I called my doctor, he ordered a chest x ray (normal) and decided that I must be having an asthma attack!! I have never in my life had asthma!! He took a blood sample to rule out a blood clot (normal) and sent me on my way! PLEASE HELP ME!!