After falling asleep tonight, I felt as though I could not breathe a couple of times, as though someone were holding me down. I struggled to breathe and get up. Twice this happened, so I put my cpap gear on and it happened again. Each time it was as though someone would not let me up to breathe. Is this normal with missing a dose of this med. I was told that I could not go cold turkey quitting venlafaxine and would have to ween off it. Has anyone had this happen to them?