Colonoscopy failed

Hi, just posting in the hope someone can shed some light or share similar experience. Recently had a change in bowel movements (looser stool-tmi and blood). Went to the GP who was great and referred for colonoscopy and bloods-bloods normal but raised ca 125 (awaiting ultrasound), colonoscopy was a massive fail- very painful despite sedation and they couldn't progress due to a sigmoid stricture, they tried peadiatric cam but couldn't get through, so I have been referred for Ct scan. Anxiety is through the roof and just wondering if anyone has experienced the same? Thanks :-)