Hi Jackie,
I was also prescribed Effexor in January for Hot Flushes, I tried on 2 different occasions to take them but was really ill, dizzy, trembling and nausea so I wasnt able to. 9 months on, I still get hot flushes but not to the severity I was. My daughter has just weaned off anti-depressants and I would think it is very similar as that is what Effexor is. She was on a tablet a day and cut to half a day until her script was finished took like a month. She has now finished completely but suffering side effects and withdrawals. Trembling, headaches, nausea, stomach pain, poor concentration, confusion and her moods are a bit all over the place. It takes about 2 weeks for symptoms to sort themselves out. I would wean off Effexor definitely, you could always ask your Oncologist your side effects but they really should subside within 2 weeks. Hugs Melinda xo