Effexor 150 mg would be roughly equivalent. I haven't personally switched anyone from Paxil to Effexor, but if I were to do so, I wouldn't particularly expect any problems.
I hope the switch goes well for you!
As always, if you feel like harming yourself or anyone else in any way, you must immediately call 911, or go to the nearest emergency room.
Please remember that I cannot make a diagnosis based on internet communication.
Dr. K. Eisele