My gut took forever to settle down. On chemo I had nexium twice a day plus needed zantac in between. (Dissolvable ones are best...script only) It has settled but even 2 years on I need nexium daily.
I have since had a scope and have been diagnosed with a small hernia and barretts oesophagus...which is cell changes from reflux! So I now don't try to do without but feel it's better to take the medication. I've also been diagnosed as completely lactose intolerant now. So knowing that has helped.
Things that helped me.
Taking a proton pump inhibitor daily (such as nexium)
Avoiding really high fat foods like pastries (sausage rolls ...although rarely eaten are a killer)
Not too many wheat products (no idea why but possibly as they sit in your gut longer ...tested fir intolerances and no issue)
Watching highly acidic foods...some fruits like pineapple etc. I can eat them now but for twelve months I couldn't have strawberries, kiwi, pineapple, capsicum without severe burning.
Hope things improve for you soon.