Hi,
I used to suffer dreadful heartburn and indigestion, the heartburn seriously made me feel like I was having a heart attack.
I also had an endoscopy and was diagnosed with a hiatus hernia.
When my usual medication was no longer available I was put on omperazole which I now take just once a day. Tbh I have been on this for a couple of years at least, and it certainly controls my symptoms, though they differ from your own.
One thing that helps me enormously is to eliminate or control, what foods made it worse and avoid them as much as possible. For me it is things like spices, peppers, raw onion, too much tomato, and fizzy drinks amongst others. I don't drink any alcohol anyway.
Whilst I would try to avoid Google for health issues (I convince myself of I have many serious illnesses if I google) I would suggest perhaps looking at common foods and drinks that can affect hiatus hernias and see if they ring any bells for you?