I feel like giving up

Farmed raised salmon from Walmart made me bloated and gassy and I had mild heartburn hours later. I’m still in the healing stage of gluten issues so that may be why. Walmart claims that their fish is gluten free. And their tilapia definitely is because I had no issues with it. I’m not sure what I’m going to do. I’m already so limited with my diet because I’m still healing and I’m doing the elimination diet. I wake up feeling weak like I’m not eating enough. I know my vitamin d levels are low. I’ve had low vitamin d before and it felt like death. I’m scared of more nutrient deficiencies. I’m trying my best to eat enough during the day so I won’t wake up feeling like this. I also get pins and needles all over and sore joints. The only good thing about this is I’m losing weight and my skin is clearing up. I want to stay pescatarian but I want so badly to be able to tolerate more foods. I can’t tolerate most of the vegan protein powders in the stores. They make me bloated and cause reflux because of the fake sugars. The ones that are clean are too expensive. I’m already disabled so being able to afford this stuff is a struggle as well. I feel like giving up.