I only started taking Zyrtec regularly about 3 weeks ago because ...

I only started taking Zyrtec regularly about 3 weeks ago because Claritin was not working for me. Zyrtec has worked but I am noticing that now, when I don't take it...I feel weird. Similar to how I did when I stopped my Zoloft. A little dizzy, nauseous, headache and now the itching makes sense. I take a pill and am better within 20 minutes. I was AMAZED to see how many people seem to withdrawal from Zyrtec- yet it isn't noted on the package that it's possible to withdrawal!!! Does ANYONE know how long the withdrawal symptoms last if I just stop taking it???