I'm dealing with a sudden food allergy reaction where everything I eat and drink just causes me to itch and I don't know what's going on. It occur suddenly and I've know to have wheat and eggs allergy so my diet is already limited but this sprung on me and it's concerning.

Just eating chicken and rice causes me to feel itchy, tingly and burning all over my body. Just drinking plain water is the same. Plain rice and potatoes also the same and I don't know what to do. I got tested for food allergies and it all came back negative which left me even more concerned. I've been taking benadryl but it's not helping and no one seem to know what's going. Even if i don't eat, I still experience the same tingly, burning sensation with itching.