I've never had food allergies in my life, but last night I had an allergic reaction and all I can think of is that it's something I ate. All of it was normal food that I've always eaten, but I woke up at 3am with itchy, raised, red rashes all over me. I knew about food sensitivities developing where your stomach doesn't "like" certain foods anymore, but this is a full emergency-Benadryl reaction.

Anyone else experience this?

Food sensitivities / intolerance is talking about not being able to tolerate certain foods, as in , your stomach doesn't like them anymore, I don't think I've heard about people becoming allergic to foods post surgery.

Honestly, you should be calling your surgical team or PCP with this, they will be able to do allergy testing to verify that's the cause of your issue.