I am 46 years old. I have been experiencing night sweats for a year now. I have had very regular periods for 36 years!!! I can predict the day, time of day, etc. they will start. I just started Wellbutrin to treat chronic depression about 3 weeks ago. My period is late. I have had cramps and P.M.S. sypmtoms for 2 weeks now but no period!!! I can't be pregnant because I had my tubes tied one year ago. Any ideas??? Anyone else take Wellbutrin and experience the same problem???