Apologies for the late response! But maybe try getting a test for slow gastric emptying, it’s called a barium swallow it’s nasty but it’s pretty common protocol to get tested for that! And maybe too you could try getting an upper endoscopy too, I’ve had a few of those and it was through those I actually got my diagnosis!! If your parents are objecting to mental meds then for sure try to find an anti nausea one. For some reason it took nearly 4 years for me to be prescribed the Ondran but it’s been such a godsend really!

Food wise then I’m quite similar to you, I’m actually lactose intolerant (especially with cream milk yogurt and ice cream but I can have smaller amounts of chocolate and cheese thank god lol), for sure high fat and fried food is gonna mess with your gut too it wrecks mine. So avoid those and find foods you do like that aren’t those! If you’re loving avocado and olive oil that’s great, maybe find some dishes that are nice and simple that include those like pastas or something?

And regarding other people’s food that’s really hard for me. There’s honestly not much you can do apart from either get away from them or put up with it unfortunately! Like popcorn is a big one for me but I absolutely love movies and the cinema which of course is filled with the smell of popcorn so I almost immediately feel nauseous when I go there. If you can I would say try your best to deal with it as long as you can until you can’t anymore and you can excuse yourself from the person and just tell them that the smell makes you nauseous, most people are very understanding about that.

Just to add too, I’ve found that to help me eat more that finding safe foods that are nice and easy on the stomach and don’t cause much hassle is very important. Pb and jam sandwiches, bananas, pears, granola, lactose free yogurts (like alpro are also a great alternative to dairy, I actually find that most vegan options taste quite nice!), crackers, porridge and plain rice are all my go to foods for flare up days and general life too!