10 Centimetre Rectal Polyp

At colonoscopy yesterday after positive qFIT test, I was told I have a "giant" 100mm rectal polyp.  Today I've been called in urgently for blood tests and CT (to check my trunk for cancer) scan, in a couple of days.  I cannot tell you how terrified I am.  Especially as I cannot find anyone on forums that has had such a large rectal polyp.  I've been told, regardless of biopsy results, I will require a 7 hour surgery at a specialist hospital to remove polyp.  Has anyone been through anything like this?  Thank you for reading, if you got this far xx