Fake allergic reactions

Let’s just start this off by saying I have a very “active” brain. I am always worrying about the future, this being something I am working on. Sometimes when I am eating something I know I am not allergic too, I’ll think, “ what if I actually am allergic to this now,” and I’ll get the symptoms of a mild allergic reaction. I won’t be feeling any symptoms while eating at all until my brain randomly goes,” what if you’re allergic to this now?” It happened today with a piece of pizza. I know I am not allergic to pizza because I have it all the time. I was eating just fine until my brain was like,” bro you might be allergic to this,” and then it hit. That same night I ate the same pizza I had earlier and by the end I realized I did not get any symptoms of a reaction because I was distracted while eating it. I think my dumb brain is tricking me into thinking I’m having a reaction.