Aside from the bacterial overgrowth, you can try probiotics. I was having a ton of trouble all of a sudden with gas and pain, especially late afternoon and evening. By morning, I would be feeling fine and my belly would be back to normal (flatish). My doctor suggested probiotics, but I had tried many in the past and they had all made things worse, D, pain, cramping..... so I just thought they weren't for me. Turns out that I just hadn't found the RIGHT one for me. There are many on the market that are good. Do a search of the forum and you will find a good starting point of brands to try, but don't give up if it doesn't work for you. You do have to give each one a fair shot. Probably a good 3 weeks or so, and you get what you pay for, the cheap brands are not worth the time or money. The right one made a world of difference for me. Every so often I have to increase my dose and once in a while I change brands for a few weeks because my body seems to get used to the strains of probiotics and I need to shake things up. But it has helped a lot.
CD 20 years officially, 30 unofficially. 3 resections '93, '95 '97
Managing with strict low residue diet, keeping symptoms to a minimum. All test show small amount of ulceration, still have occasional blockages. But still have a great time with my 2 daughters and husband!
Prednisone, 6MP,Prevacid, B12 shots, Bentyl, Xifaxan.....