Talk to your doc, I think they can prescribe something. Don’t suffer. Modify your diet as much as possible. Try papaya enzymes, drinking apple cider vinegar, and drinking aloe (none of that worked for me but YMMV - I even drank baking soda in water, blech).
Go easy on the Tums, you can give yourself a kidney stone if you have too many.
You have my sympathies, I used to wake vomiting and choking on my own stomach acid that’s how bad my heartburn was. Reading your post made me remember how I couldn’t even drink water without burning. It was awful, just awful.
https://www.dcurbanmom.com/jforum/posts/list/986735.page