@Margo34 DS2 had horrendous reflux, would project vomit, inhale vomit in lungs and ears, have constant chest and ears infection, and we tried every thing. He was on lansoprazole, but it didn't really help . It didn't make things better but he was worse without it. He cried non stop for the first 8 months of his life.
He was EBF and was told by gastroenterologist to follow a diet similar to yours. No dairy, no eggs/poultry, no citrus, no tomatoes.
When weaned, he got worse before getting better. They did some blood test and he had a no dairy, eggs, wheat diet, which was very tricky because a lot of the gluten free products I was looking at for the no-wheat had milk powder or proteins.
Diet wise, my advice to you is to go basics, so a piece of steak or fish (not fried, no batter) with some veggies on the side and a bit of rice, Fruit salad for breakfast, lots of salads, cooked vegetables, ...
Like for the meds, the diet was more to alleviate reflux than fixing it. It will pass.
He is now a teenager and eats for four. Very athletic and strong. He has however asthma and a severe (anaphylactic ) penicillin allergy , probably from overuse when he was a baby . Had it at least once a mont from week 1 because of infection caused by vomit.