I took effexor for about 6 months and while I was on vacation, I ran out of it. the second day w/o it, I started getting panic attacks, I couln\'t stop crying, my lips and arm were numb, I would get chills but yet I was sweating. I swore I was dying...it was the worst feeling ever, but the whole time I was on it was great, however, after that, I stop taking it little by little.