I would advise seeing a clinical nutritionist. Gut health is a very topical subject and there has been a lot of research and new developments in this area. If you Google Stephanie Moore clinical nutritionist and author of Why Eating less and exercising more makes you fat, you will learn a lot more. It is a very interesting read and well founded research. Over the counter probiotic drinks are apparently useless, but kimchi, sauekraut (home made, not off the shelf) kefir etc are all excellent in promoting good gut health. Stephanie consults in Harley Street and at Grayshot Spa in Surrey. I am nothing to do with her at all, but recently completed the 7 day Regime at Grayshott which focuses heavily on gut health. You are right that Omniprazole is not good for you and if your gut is in good nick you should not need it.