Could I be allergic to Nettle Tea?

Hi all

I was wondering if someone can tell me if a person can be allergic to Nettle tea.

The herbalist I got it from has me boil 5 cups of water then removing it from the heat adding 1 oz of Nettle then I put lid back on and steep for 2 hours. Strain

I drink one cup in the am and one cup in the pm.

I notice when I drink it I get inflammation in my lower throat area (maybe my thyroid). I also get a itchy scalp.

I am wondering what this is.

Thanks so much for the help.
Maggie

PS. I emailed the herbalist on Monday and she hasn't gotten back to me, so trying to figure this out on my own.