This is Dr. David
you need to see a doctor right away
you could have a hiatal hernia of your stomach being pushed up into your chest through your diaphram
you could be having excessive swelling of your bowels from colitis or bowel allergies like to gluten allergies or milk lactose allergies.
you might need a colonoscopy to check for colon swelling
you can try avoiding gluten in bread, pasta, pizza for a week and avoiding dairy and bread and see if this helps your symptoms.
you need to avoid spicy foods and alcohol and foods which worsen stomach acid.
you might need stomach acid reducing medications like zantac, prilosec or maalox, mylanta to reduce stomach acid.
scar tissue from abdominal surgery can cause obstruction which usually causes severe abdominal pain and nausea and vomiting
you might benefit from an abdominal CT scan to look inside of your abdomen.
have you had a CT scan recently?
have you had a colonoscopy before?