Omeprazole continued working to mitigate or even eliminate my gerd, but it also destroyed my kidneys and bones. So I stopped taking it, and I have grade C esophagitis.

What I did:
1. Most importantly, switched to low-acid, low-fat diet. There is a FB page devoted to recipes for that kind of diet THE ACID WATCHER DIET WARRIORS. Dr. Aviv and Dr. Koufman are two ENTs who have published books on gerd/respiratory reflux and give diet and other tips. https:jamiekoufman.com . You can also google low acid food lists. Goodby oranges and vinegar! Processed foods are notorious for acid as a preservative ingredient. Whole food or minimally processed is best.
2. I sleep sitting up; other people do just a 45 degree angle. You can put blocks under the head of your bed, or prop yourself up with pillows.
3. Eat smaller meals, more frequently.
3. Don't eat late in the day, and give yourself at least three hours between mealtime and bedtime.
4. Gaviscon Advance aniseed; you can buy on Amazon. Expensive since it is shipped from the UK. There are cheaper versions. If one of those works for you, great. Gaviscon is an alginate that creates a plug between your stomach and esophagus, keeping your acid in your stomach.
5. Chewing sugarless gum after eating or while exercising. Saliva is your friend!
6. Don't bend over. Bend at the knees when needed. I speak as someone with bad knees.

There are a few ideas to try to see if they work better for you than omeprazole. Diet is key, and it won't work overnight. You should see improvement in a month or two though. Keep your doc appointment and try non-med management in the meantime since the PPI isn't doing anything for you anyway.