I am a post bowel cancer patient who received chemotherapy in 2006 it was then that I was diagnoses with AF. No treatment has been given other than to control my BP. My GP now wants me to go on warfarin but he cant answer this question. I still have side effects from the chemo - Peripheral Neuropathy and feeling cold. will Warfarin affect me adversely or make the symptoms worse by interacting with the residue of the chemo.