Possible hypochondriasis??? Help!?

Ok so three months ago almost to date I was at my friends house inhis basement he has a German Shepard and there was dog hair everywhere and like all of a sudden I felt like I was having trouble breathing it was a really scary experience and his mom was an idiot nd let me take a puff of his inhaler before rushing me to the hospital. When i got there it was the weirdest thing the doctors said nothing was wrong with me or at least they couldn't tell if there was. So I've been tested for asthma and I don't have it , I went to he allergen and took the standard test...NOTHING. I'm not allergic to dog hair or anything else in fact my back didn't even itch when they dishes test to me. So to sum things up I've literally convinced myself that I have asthma and I carry an emergency inhaler with me everywhere. Ever since this experience I get so worked up over stupid crap and I think I'm going to die from like everything. I even went through a stage where I was getting panic attacks at the minimum once daily. I also have had pretty steady depression, and about every single symptom of anxiety disorder other then derelizTion. I looked up what hypochondriasis was and it seemed to fit me kinda well. So I'd like to know what you guys think? Do you think I'm. A hypochondriac and what can I do about it? Also any ideas on what happened that night in his basement would be great. Thanks