Hello, Thanks for writing to Health Care Magic, I am Dr Asad Riaz, I have closely read your question and I understand your concerns, I will hereby guide you regarding your health related problem. Allergy to drug is no very uncomon,many drugs can cause it like Ab including pencillin,as NSAID in ur case ,food allergy ,pollen allergy etc..for proper dx of allergy that what type of it n what can cause it there are many test for it like,blood IGE level is it allergy reaction,skin patch test etc..for such an severe reaction in whch pt have difficult in breath n decrease bp called anapyhlactic reaction need to gve epineprhne n airwasy suport ..for such type of pateint always ask tehm to have epinephrine along with them esp he/she hving food allergy n cant avoid it or dont now really what type of food causing it....in ur case as u having allergy to NSAID group so avoid these med n go check for other drug allergy n always use drug (esp that are prone to allergy reactaion ) after test dose.. I hope this answered your question, if you have more feel free to ask. Regards. Dr.Asad Riaz. General and Family Physician.