I've had triple bypass surgery within the last year, and had surgery caused by acid reflux two years ago, so have taken all the drugs you are taking, I'll bet, including Omeprazole. Your heart drugs have many more side effects than Omeprazole.
I'm guessing that during your surgery and consequent blood tests, it was determined you showed signifcant GERD problems, hence the Omeprazole
prescription. Like you were advised by boognell, I'd take it, and soon.