Feel gas moving around frequently in my abdomen i can hear them and have gassy bowel movements, flatulence pushes them out and sometimes float. anus feels tight. can this be due to infection, food allergy or stress?

The gas & peristaltic activity are not problems unless you're having difficulty expelling the gas rectally. Taking simethicone 1/2 hour after a meal prevents gas buildup. Also avoiding gassy foods&beverages is advisable. If most of your stools are normal, I don't see a real problem or a need for a GI consultation or testing at this time. However don't hesitate to get checked if you're still concer