I just had ultrasound&came normal. Is this gerd, usually feel full of gas in my stomach upto my chest, diffulty breathing I have to burp to feel relieve?

Probably. Hi, Sure it may likely be gerd given the symptoms your are discribing. There're several OTC medications that works for acid reflux, however you should see a gastroenterologist to check for other underlining conditions such as bacteria over growth, ulcer, H. Pylorie infection, and celiac disease.