I'm so sorry betty, i hope i didn't worry you too much about it.
As Septor said, everyone is different. But i was told by a few doctors of it's withdrawl effect, and had heard from others who experienced the same problems.
I went without it for a few days, as i didn't have a script, and no doctors were open, so i had to ride it out so too speak.
I got very anxious/sweaty/couldn't sleep(which probarly didn't help, as i have severe insomnia anyhow), and symptoms i couldn't really explain.
But at the time i remembered thinking....is this what it's like to have a drug addiction(i wondered)? I was pretty close to going into the pshyc ward as i was so wired up. I didn't, but when i got the effexor back into my system i felt much better, even though it didn't work that great for me. Maybe because i was on a fairly high dose/ and then going cold turkey didn't help. And if you were to discontinue with effexor, and lowered your dose slowly, you wouldn't get as sick.
Again hope i didn't scare you, just trying to help out, and hopefully avoid you getting sick
Take care betty