Though your comment was 4 months back, yes, I have just starting have diarrhea this week and I have to watch it because I am regularly underweight (110 lbs).
I have been weaning from venlafaxine for 4 months now . It is slow going and just this past wk diarrhea and severe depression has set in.
I am seriously considering returning to taking the medication. It is very hard to see light at the end of the tunnel.