I had a mastectomy in April 2004. Since that time, I have been on Arimidex, Femara or Tamoxafin for varying amounts of time due to the side effects of the drugs. I have been on Tamoxafin for the last year. I developed several side effects (severe fatigue, back pain, sore throat, shortness of breath, one side weakness) and it took several trips to prompt care to figure out what was causing it. I went off Tamox. for 3 weeks and started to feel much better after 1 week. I started taking it yesterday and am feeling tired already. Is it possible that you can have the side effects that quickly?
