Mamas with food allergies sensitivities etc

I have a big issue i had alot of food allergies and with my first pregnancy many went away including my issues with wheat which causes me severe migraines stomach cramps nausea diarrhea and now I’m unexpectedly pregnant again and have gotten used to eating it and the symptoms have returned, with my first pregnancy i had no cravings but this pregnancy i do and im really struggling to eat because i cant eat what i crave and the alternatives are not what I’m wanting so it makes me gag or vomit but if i give in i feel like 💩 and can’t function if I don’t give in its mental torture and makes me want to cry and lose my appetite im mostly venting but would love suggestions