Thank You,,,,In Dec I Had A Third Chemo Treatment That

Thank you,,,,In Dec I had a third chemo treatment that caused a fistula to break and I now have a temporary colostomy,,,,,Today I visited my surgeon and he recommended a ct scan and a colonoscopy,,,,Is the latter really necessary as I am not in favour of this procedure? if the CT scan showed something then yes I would want it done,,,Nervous. Bev