Deep, your progression of symptoms sounds a lot like mine. I was super regular for years, then things started going downhill and I put off having it checked out for a long time. And then I wasn't pushy enough when I did go in. Despite all that, my prognosis was good and I feel like I'm in a good place, or will be soon.
My GI doc also told me right after the colonoscopy. I did the twilight anaesthesia thing rather than full anaesthesia for the colonoscopy, so I figured it out on my own based on what they were saying during the scope. He wanted to make sure I understood, though, which I appreciated. He did say it looked to him like cancer, and said they would call my nurse and let her know how things looked (I had already been admitted to the hospital, so I was on the fast track).
Good luck, and hang in there. We're rooting for you! Keep us posted. I was 48 at diagnosis, and everyone I talked to was very upbeat about my situation because I was young and in good health generally. And you've got another 10 years on me.
And colon cancer is slow-growing, so if that's it, weeks aren't going to make a very big difference.
DX: sigmoid colon cancer 5/2018. 48 F
laparoscopic sigmoid resection (24 cm removed); no stoma.
7.5cm adenocarcinoma -- mod. diff.
1 noncontiguous tumor deposit removed; 0/31 lymph nodes
T3 pN1c M0
5/18 before surgery, CEA 11.2
6/18 began FOLFOX
7/18: CEA 1.9; added neulasta post infusion
9/18: CEA 2.8
10/18: 25% chemo reduction
11/18: CEA 1.8
7/19 CT scan clear