Effexor experience
I would definatly suggest to set up a (slow) taper schedule with your doctor since Effexor (Venlaxafine) is known for its extreme withdrawals in some users.
I was prescribed it for about 6 months together with a tetracyclic antidepressant called Mianserin and decided to taper off after having my first-ever seizure in my life, which was a truly horrifying experience. I decided to have a glass of light wine and a small amount of Cannabis to help me sleep when I suddenly felt very wrong, I was able to stumble into my mothers bedroom before collapsing on the ground and being unable to move for at least 5 minutes, I also blacked out briefly I think.

Also I felt that after six months of antidepressants I didn't feel emotions, I was just... never sad and never happy is the only way that I can describe it so decided to stop taking them and taper off slowly.
I still refer to Effexor as Side-Effexor since the brain zaps and electric shocks were horrible and they scared the hell out of me, even after a very slow taper (I was using 37,5 mg at the end of my taper) I got all the withdrawal symptoms including chronic insomnia, loss of appetite, no sex drive and those scary brain zaps/electric shocks. Those symptoms lasted for months and I still have trouble sleeping nowadays, but at least I am able to feel emotions again.
I still fear antidepressants because of this medicine and would rather go cold turkey of Tramadol and Ritalin at the same time than experience the Effexor withdrawal again.
I would suggest that you read through the Erowid experience vaults to know how other people have dealt with this (IMO horrible) SNRI, just do a search for Venlaxafine and enough reports should come up. I can't tell you anything about taking MDMA or MDxx while on Effexor but I have found some reports I will post here:
Combined with Psych Meds - MDMA (Ecstasy), Pharms - Divalproex, Venlaxafine & Risperidone by
Bipolar Girl
Kills the Effects of MD* - Venlafaxine (Effexor) & MDA by
Cactushead
Notice BTW how few "glowing experiences" and how many "Health problems" or "Addiction & Habituation" reports there are, it really is an evil med IMO
I hope you can kick this med without too many problems and hope my post contributed something to this thread, good luck & be safe.
Peace o/