Sudden onset of constant burping and bloated stomach. accompanied by nausea & shortness of breath that i have felt for the last week. no diet changes?

See your doctor: Problems like these can only be correctly handled by your doctor in person. He/she needs to listen to you, perform an examination and possibly run labs or other tests. That's the only way he/she can find out what's going on and what to do about it.

Sounds like indiges-: Tion or reflux. Try an otc antacid...If no relief then talk to your physician.