Damaged stomach and unable to eat without vomiting for weeks, How to help ease & what foods to eat?

I’ll try keep this as short as I can.

Ive been dealing with, what we believe to be, a bit of a damaged stomach & possible infection for about 4ish weeks now, with it only getting worse.

Pretty much any food I eat, and ive tried a lot of the recommended, I throw up on top of having really bad diarrhoea almost every day this entire time. I have pretty much only been able to handle a few crackers a day, if i can eat that day, and even then it still hurts my stomach a bit

Because of this, my energy is at a completely new low (I already suffer with chronic fatigue) and im passing out any time I try to sit up and hardly able to stay awake most of the time.

Im wondering on what people will suggest to try get my energy levels back up, what food can I eat that perhaps I overlooked? And Is there any way to speed up the healing of this?

Thank you for any advice, sorry if this got a lil lengthy! I’m suffering 🥲

Ill add some additional info at the bottom here, not sure if any matters:

- I took Ibuprofen quite regularly for my migraines & thats what we think might have done it (unsure as waiting for stool tests still). I stopped this about 1.5 - 2 weeks into this issue

- I saw a doctor for this & taking 2 15mg lansoprazole a day for 2 weeks before going down to 1 for 2 weeks, im about a week into this but still getting worse

- Im autistic so struggle with a lot of textures, which is why the BRAT diet is not something I could exactly do, (Bananas & Applesauce). Toast as also upset my stomach a lot, and same with rice.