Sorry to read that you are not feeling well. Most people here advise to get a colostomy to confirm what is going on inside. If it is something they can deal with on the spot they will, if not they will do a biopsy to see what is going on to come up with a treatment plan.
Lastly, even if things are ok, the best way to know is to have the colonoscopy. Evidence matters in the proper diagnosis of what is going on with you.
I wish you luck in uncovering the good and bad and moving toward a successful solution.
Spouse of wife 47 years old
10/2014, Stage IV Metastatic CC
Lymph node involvement 12/15, w/ positive PET on para-aortic lymph nodes.
5 cm sigmoid tumor resection as well as positive Virchow lymph node.
KRAS mut, Highly Differentiated, Lynch Negative
Folfox and Avastin 1 YR (Oxi for 5 months) NED 05/2015
Zeloda and Avastin since 01/2016
Chemo break 03/2017, back on Zeloda and Avastin 04/2017.
"...Perseverance is not a long race; it is many short races one after the other."