The withdrawals are the worst possible feeling in the world. It's easily on par with withdrawal from hard opiates in its severity, duration and the amount you will wish you were dead.
The nausea is so unbelievably strong
, but even if you throw up it doesn't go away. I have heard the only way to stop it is marijuana. Sadly for people like me with no access you are debilitated, you can't do anything except sit there with your head in your hands thinking about how sick you are! And from research this condition of despair lasts for two whole bloody weeks!!!
Let's put it this way: I'm a student and have run out of money and can't afford my Effexor (150mg/daily) and am starting withdrawals (two days off it). Tomorrow I'm going to have to grab whatever valuables I can and go to a pawn shop and sell them so I can stop the withdrawal symptoms. The only other time I have been forced to do this was *very* heavily withdrawing from opiates! THAT is how bad the experience is!!
And of course when the doctor puts you on the medication they say *absolutely nothing* (!) about how you will have to be Superman to bloody well get off it ever again and just how severe ones physiological dependence on it becomes. If they had bothered to mention how severe the withdrawal was I wouldn't have gone near it, but instead they write scripts for this crap like candy and talk about it like it's some harmless and mild medication.
My experience of Effexor (ie: not during withdrawal but just day-to-day use): brain-zaps (can be very unpleasant), dizziness, NAUSEA (varies considerably, especially with heavy physical activity), spaced out feeling, headaches, complete lack of motivation, entire loss of libido (sex seems entirely pointless and not worthy of pursuing), etc. If you miss a dose (pretty much unavoidable at times) you will sorely regret it.
PERSONAL OPINION: Stay the hell away from Effexor. I talked to another GP once and he calls it "Side-effexor", and with good reason!!