Want to share what had helped tremendously.
My story:
Took omeprazole for about 15 years. Had an osteoporosis diagnosis and learned that it affects my bone density. Last year I tempered off of omeprazole really slowly 1 mg per every 2 weeks.. Still I had incidents of bad rebound with heartburn though I tried the 'right' things: off and on famotidine, alginate every evening, elevation in bed, slow eating, less or no sugar, slippery elm... But still a lot of heartburn - to the point of feeling truly desperate.
Till I read in on reddit of diaphragmatic breating. Most videos don't explain it thoroughly or way to quickly but this therapist demonstrates it wonderfully in Part 1 and 2. The videos are 7 years old but guess that doesn't matter.
Can't add a link here so google on Youtube Challenge Physio Acid Reflux Part 1 or Part 2
I do about 2 x 20 deep breathing exercises a day and doing them regularly is crucial, but it is such an simple solution that targets the cause. Hope that this might help someone out as well.