I Am Using Effudex Again For Early Skin Cancer. I

I am using Effudex again for early skin cancer. I am using it basically all over my chest wall. I used this before...many years ago...but five days into this, I am nauseous and tired and I just dont feel right. The only change I have is this cream. I remember the pain and soreness, but dont remember how I felt. I want to finish out the next two weeks, it beats the alternative.