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I will continue with the Piriton, 237. I just wanted to know how long to take it for, really. Not knowing what type of pollen it is, is a a bit of a pain.
Many years ago, I was on playground duty at school and during the following lesson, my face and arms and legs swelled up in a blotchy red mess. I was sent home, but called in the doctors on the way. I demanded that I saw a doctor and, when seen, was given an injection of epinephrine. I then collapsed and was in the surgery for an hour, recovering.
I then spent the next twelve days, at home, covered in wheals whilst taking antihistamine tablets. It was truly awful. I/we never did find out what happened.
I carry antihistamines with me all the time, if I'm away from home for any length of time.