First episode 5 years ago, same thing a year later caused by stupidly grazing on party snacks...
Carried an Epi Pen for a while but now I just take antihistamines as soon as the itch starts. (starts on soles of feet then ears, groin etc)
Takes about 20 minutes to start getting really bad.
Fast acting antihistamines seem to fix the problem.
Best to avoid red meat.
Best to avoid green meat also!

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