How do I know if I have a Food Allergy?

As far as I know I have never had any food allergies but now 13 days post op I think maybe I have had a few. First weird thing is my ears: from about 6th grade I have had excessive itching and wax in my ears. I always was sticking something in them to scratch( about 6-7 x a day)Now after surgery no wax no itching at all! Ihave had greenish/grat/brown bruise like circles under my eyes since I was in my 20's when I got my first cat and attributed it to cat allergies because when I pet them and touch my eyes they become itchy and watery and swollen. I still definately have my cats but I see a difference in the color under my eyes and they appear to be wider open. I didnt even think they were puffy before. I am still on liquids and to my best guess I have only lost 10-12 lbs so I do not think it is due to weight loss. Could I have had a food allergy that I didn't know about?How do I find out and If it is How do know which food it is? Has anything similar happened to anyone else?

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