I have been off of effexor for almost two weeks. I felt great the first 2 days and then had upset stomach and vomiting. It went away and I had surgery Tuesday. I started with the headache, sweats, vomiting yesterday. I know it's not the surgery because I just had the same surgery on left arm 3 wks ago. I was hoping I was over the withdrawal symptoms.....oh and all I want to do is eat when I'm sick to my stomach. It's like comfort and I'm afraid I'm going to gain even more weight.