Diet? Contrast liquid? Have you been on antibiotics?
Are you eating more whites than usual (white bread, cake, potatoes? ), did you overdo it at Thanksgiving?
Have you tried a 2-day protein fast (just meat, fish, chicken, soya...no milk products, not breads or carbs...)...it can help a lot to figure out if it is the food or another problem...
When I get gassy I get off of the bread and cheese (or pizza, pasta, etc) and it usually calms down rather quickly.
A run of probiotics can help too as long as it is not another underlying medical problem.
Sharon