Is it normal for your body to be allergic to someone?

So, I have this massive unrequited affection/love for a colleague because I entertained a fantasy relationship with her in my head, long-term. Every time we communicate (which isn't often), I feel frazzled afterwards, am either ecstatic with joy or wishing coronavirus would just take me.

Then about 6 hours later I get allergy/cold symptoms (headache, nasal congestion, sneezing etc.) and these last half a day, or a day, then disappear.

Is it normal that my body seems to have an allergic reaction every time I communicate with this person?? Most of the time it's by email, and I seldom leave my apartment!