I bought the Sam's brand of omeprazole, and ever since I've started taking it, I have more acid and gurgling. It's weird, because I was taking the Target brand, and wasn't having these problems.

Often the inert ingredients are different from one brand to another. Sometimes they are corn based, wheat based or other things like glycerine. I wonder if you are having a reaction to one of the inert ingredients?

As a side bar to that comment if you Dr will write you a script for it you can get 30 days from Walgreens for like $4. It was a lot cheaper than OTC.