Nervous - been given a cancer referral for an up and down colonoscopy after blood test showed I'm anaemic. Has anyone had the same?

Hi new here had bloods done it showed I’m anaemic but I’m 52 had hysterectomy 7 years ago so no periods so doc has said he’s sending me for up and down colonoscopy on a cancer referral  it’s scared life out of me! I had gastric bypass 5 years ago too ! He said I could be slowly loosing blood as it’s not low enough to need transfusion! Think 115 from memory!! Please has anyone else had the same