@thepainter1

Did they give you a diagnosis? Do you have a hiatal hernia? Did they tell you to take a PPI?
Are you on a proton pump inhibiter (PPI)?
examples:
omeprazole (Prilosec, Prilosec OTC, Zegerid)
lansoprazole (Prevacid)
pantoprazole (Protonix)
rabeprazole (Aciphex)
esomeprazole (Nexium)
dexlansoprazole (Dexilant)
or H2 Blocker?
examples:
Axid
Famotidine (Pepcid or Pepcid AC or Pepcid Complete)
Tagamet
Zantac

I suggest trying an H2 Blocker. Famotidine aka Pepcid is a pretty good one and you can take Mylanta between its doses. I use store brand of Pepcid Complete. I don't do well with pills .. but chewable I can handle.

You may need more tests to figure out what is causing so much acid.

I do suggest you keep a journal of when you have the acid most. Notate when you ate, what you ate and how bad acid was .. did a little come up in your throat .. did you cough acid up. Instead of 3 meals a day divide those meals into 4-5 or 6 meals. Being too full can cause acid to come up. Notate what food make the acid worse. .. Worst culprits for me are greasy.. fried, spicy (onion, garlic, peppers, oregano etc), and sugary foods. Also raw fruits and vegetables and foods like cabbage, celery and broccoli. Acidic coffees and teas. .. If you must drink them find low acid ones. Wait several hours after eating before lying down. For me that is 4 hours .. sometimes longer if I misbehaved.

Try raising the head of your bed by placing something under the legs of the headboard to raise it a few inches. Instead you could use a wedge under your upper body to raise your head or use two pillows in a wedge fashion.

I hope some of these suggestions help and that you can get help from your doctors in figuring out the cause and options to treat.

ZeeGee