After having an mtop 3 weeks ago my lower tummy is really swollen and i have really bad gas that seems to make me more bloated which is painful .

Post-op bloating: The MT ?operation is an enigma, but I assume you may have had some kind of abdominal surgery. Post-op bloating is common (called an "ileus") and usually responds to time, increased activity and slowly advancing the diet. If you aren't passing the gas, or beginning to have stools, then f/u with your surgeon. Localizing pain should also be investigated.