Hi M.!
I have lots of experience with this drug (and many other SSRI's). I strongly STRONGLY encourage you to do some internet research on this drug and how it has affected people if you have not already.
The thing about Effexor for me, is that it worked great at taking care of my major depression symptoms. I never felt depressed. The horrible, intolerable thing about this drug, however, is that it has an incredibly short half-life, which means that when you take it, you can 'feel' it start to work, and if you happen to miss a dose or take it late, you can feel the withdrawal symptoms almost immediately.
The withdrawal symptoms are heinous. Profuse sweating, headaches, body tremors, fever, extreme vertigo, blurry vision. Weaning off of this drug is not only difficult, but dangerous, and takes many months, sometimes over a year, to fully wean off. People have been hospitalized from Effexor withdrawal.
I took it for over a year, and I loved the control it gave me over my symptoms, but absolutely hated the side effects. It also caused insomnia. The insomnia worsened over the course of my treatment and eventually affected my life so much that it led to my switch to Prozac.
I would NOT recommend this drug to anyone, because it is notorious for its side effects. Make sure you read & research before taking it. And please, do not take it while you aren't at home. Wait til you get back.
I hope that helps!