allergens were causing the majority of my reflux - causing phlegm, and then my stomach ramped up acid production to eliminate it. Taking daily anti-allergen pills has helped immensely.
For short-term fix, a shot of diluted vinegar can help.
Probiotics seem to help too.

FYI, if you try to come off omeprazole, do so VERY SLOWLY. Go from a full pill to a half pill, so OTC, then off. Doign so rapidly will give you such bad heartburn you''ll think you are dying!

FYI, taking it for long term affects what minerals etc your body absorbs, so if you can, slowly wean yourself off. I know it's hard tho, so good luck!

Avoid late night eating, avoid allergens (common are soy, dairy, gluten, wheat, corn..) include ginger, digestive enzymes, apple cider vinegar...

stay away from fried foods and gum mint makes it worse

I stay away from caffeine and high sugar drinks that’s what always caused mine.

I started taking a good probiotic a year ago. It works great!!! Still need my Tums from time to time, but tons better as long as I take it.