Living with these miserable symptoms!!

I moved to DC over a year ago. Ever since my move I began having crazy symptoms that I never had before. I began consulting doctors thinking I have some kind of acid reflux problem. My symptoms were and are the following; shortness of breath, sometimes coughing, really bad nausea, stomach bloating, heart beating fast, and being tired but not being able to fall asleep. I began researching and after many doctors visits I self diagnosed myself as perhaps having some kind of anxiety disorder. I haven't seek any therapy but tried looking over some ways of calming myself which sometimes work and other times doesn't work. Most of all I just live miserably sometimes. I don't know how to stop this. Winter time it is worse, as the weather has been getting colder I feel the shortness of breath (which I didn't have when it was warmer) coming back...and the nausea! I can't point my anxiety towards one thing, it seems it is there and applies to many different situations. At first I thought it had to do with work and the fear of sitting in a meeting and panicking, etc. Now it's full blown all the time. Can anyone relate to this? It is a miserable feeling that I would never wish upon anybody else.