shortness of breath all the time

Three years ago I was aborad in Austria when I got a really bad cough. I ignored it for awhile and it finally went away. The thing is afterwards I started having shortness of breath all the time, 24/7. In all honesty, I am not in pain and it is not bad enough to be really noticed by others but it is annoying. I yawn and sigh so much to make up for it and every two minutes or so I need to take a really deep breath. Even when I take a deep breath sometimes it feels as if I didn't inhale it all the way. When I came back to the States my doctor sent me to a specialist to have a upper Gi Endoscopy done and they found a stomach ulcer (negative for H pylori). They put me on Nexium and told me the two were related but even though my heartburn went away the breathing thing remained. I even lost weight to see if that would help and it didn't. I am going back to the Gastro. specialist (different doctor) for another endoscopy to see if he can find something different. It is worse during exercise and at night. My friend, who is a LVN, told me it is asma, but can asma be 24/7? Also, you should note that I had a Peak Flow test done and it came out average. My doctor's also listened to my lungs and said they were great. One of them suggested anxiety but I am the most relaxed person I know, I feel that just because it is not that noticeable I am getting the brush off. Could what I thought was heartburn be related?

I also get those weird throat croaks or burp like behaviors all the time, starting right after my cough in Europe. It starts in my chest then goes half way up my thoart, then my body forces it back down. It's pretty embarassing sometimes because it makes noises. Could these be related?

Any advice is appreciated. I would like to go back to my doctors prepared with information. Thank you.