Anyone baby possibly allergic to Garlic, onion, tomato?

I don’t know what I am missing that’s making him still have a reaction. I have given up pretty much everything and I cook at home with minimal seasoning but I do use a lot of garlic. Could he possibly be having issues with Garlic? I am literally at my ends and I am not getting enough calories in. I have started getting dizzy probably because I am not getting enough calories. My main issue is that he gets a stomach pain that keeps him awake and also gets a rash.