If you have some inflammatory thing going on in the bowel, that is independent of your food intake, there are a couple of things you can do.

1) Beano is a must for anyone eating alot of veggies. It blocks gas production. (I use this myself)

2) Frequent runny type stools may be firmed up with Metamucil type bulk laxatives. This absorbs excess fluid, and also acts as a sponge to absorb toxins that may be irritating the bowel.
Some low grade food toxins, stimulate bowel parastalsis.

3) OTC there is Imodium. I find that 1/2 tablet is enough for me when I need help. You can then increase to 1 tablet if necessary. It is easy to get rebound constipation using it however.

4) Gas-X (simethicone) can help you pass gas more normally, but it does not get RID of gas production.

Colitis or other inflammatory conditions/bowel infections may be present. So if this does not resolve, you need to be evaluated for those.

There is a theory that long term use of acid lowering drugs, promote bowel infections. This is because the high acid normally found in the stomach is nature's way of killing off undesirable bacteria that are eaten with our food. When you reduce that acid you not only impair protein digestion, but you allow then these invaders a free pass into your gut.
I believe much illness has resulted from overuse of acid blocking drugs.