Hi, I have been taking Venlafaxine ER for about 6 months now, I am up to 225 mgs daily. I am having extreme night sweats, waking up with my hair and body soaking wet and shivering cold. During the day for the past 2 weeks I m having hot flashes and then freezing cold. I am nauseated, light headed and dizzy (only for the past to weeks). I thought I had the flu but my nasal and blood tests were negative. In 1996 I was Diagnosed with Ulcerative colitus but it was in remission and the way I feel is just the same except for the profuse night sweats and the hot/cold. I am a 55 year old female but I had a complete hysterectomy at age 24 and feel that it can t be hormonal. I have an appt with a GI specialist on 1/23. Please help, I feel terrible Thank you, Stacey