I have a condition with the exact same symptoms and it sucks until you realise that it isn't that bad
This sounds like me. After many years with acute gastritis back and forth + IBS, chronic stress and an eating disorder my stomach is severely ****ed. I've been taking digestive enzymes for years and they really help! I had to stop with gluten, dairy, onions and eggs.
I take other meds from Sweden which I think helps really well. I'll try and find the names of them for you!
Eating bananas has been my savior, boiled fish, boiled potatoes, porridge etc. Really boring but it really helps.
Hope this helps sorta. My mum's got chronic gastritis and she got some stronger pills from the doc than the ones you buy at the pharmacy so talk to your gp! It's a lot better now for her now so stay strong and it won't be like this forever.