(out pouching of the wall of the large intestine) harbours residual stools and the bacteria in it grows to ferment and thereby causing gases & bloating
have high fiber diet. Flax seeds are ok but are you overdoing the flax intake?
try isaphghaul powder (any make) 2-spoons with warm water once at night as this will help you form smooth uniform and bulky stools.
you may need a colonoscopy
done again for correct diagnosis