Hi
Welcome to the MedHelp forum!
Commonest cause of chronic nausea and vomiting is acidity. Take omeprazole (empty stomach in morning) and antacid gel and see if it helps. Liver and kidney dysfunction is another cause. Hence kidney and liver function tests should be done. Other causes are diabetes and hypothyroidism. Electrolyte imbalance too can cause nausea and vomiting. IBS, gluten or lactose intolerance, parasites in gut too can be the cause. A stool test should be done for worms, giardiasis etc. Chronic hepatitis or chronic infection of the gall bladder are the other possibilities. Also if nothing is found then food challenge test to detect food intolerance should be done. 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, nausea and vomiting.
Please consult your PCP for primary examination followed by proper referral.
Take care!