Yes,
It is a nightmare that is rare so a lot of people cannot understand it. I can not walk for long periods of time without itching very severly. I have found that Zyrtec has helped when Claritin did not. For me this started at 17. I was given Seldane not Seldane D which was taken off the market so I was back at square one for years as Seldane D did not work. I dont know what I will do without Zyrtec.