It is surprising that all foods will cause allergy-however some auto-immune phenomena may be happening for which you must contact auto-immune disorder experts and researchers in research institutes in your country. For relief , apply cortisone
creams as it does help you.have you been prescribed anti-histamine
tabs ever by any doc.?Please try phenargan (promethzine)or chlorpheniramine
maleate(avil) tab 2 hours before meals ,consult dermatologist
also to confirm whether these tabs could help you?