Thanks for the great response.
My bowel movements have been a little irregular, but no diarrhea or constipation. I would say not too much out of the ordinary. Lots of burping, though, and probably more gas than usual. When I saw my GI doc, he pressed on my stomach and it was very tender but I don't have pain there. Only when he pushed it.
My wife mentioned the allergies too, but I've never been allergic to anything. I can't believe it would start all of a sudden like this... but maybe it's worth checking in to. An allergy can cause a shortness of breath or tightness in the chest?
Also, this all began after I had a cold in October. Had a bad cold for about a week and then it went away but I felt this small shortness of breath lingering. Went to my internest who gave me antibiotics, which didn't help. Ended up going to a pulmonologist, who gave me an inhaler and steroids. Neither worked. But I've always wondered if the cold had anything to do with this...
Thanks again. Looking forward to hearing from you.