Keep a food diary and see if there is a co-relation between what you eat and symptoms that appear. Chronic constipation, sedentary life style building up gas
in the gut, inflammatory bowel disease, food rich in sulfites (molasses, dry powder, pickles, tinned shrimp, cookies, crackers, and readymade pie dough), cabbage, raddish etc also cause bloating and nausea.
Do discuss this with your doctor and get yourself examined. Take care!