Please try not to worry. I know that's difficult, but there's nothing to be accomplished by stressing out. There are a bunch of things it can be. An ultrasound may provide the answer...and it may not. A colonoscopy is really the best test. Are you in the US? I never dealt with a hospital for a colonoscopy. My regular dr referred me for it and it was scheduled with the GI doc in about a week. Waiting over a month just to discuss a simple scope seems excessive.
If you try to self-diagnose and use the internet for research, you'll be planning your funeral by the end of today. Stay off the internet for medical diagnoses!
I wish you all the best.
Colonoscopy 2/17, 5cm tumor descending
Diagnosed stage iv, liver mets 3/17
Colon resection 3/17
Told surgery not an option, get my affairs in order
Meet w/MSK team 5/01/17
Liver resection/implant HAI pump 7/17
HAI pump chemo(5rds) 8/17-2/18
Spot on chest CT 10/17
Lung biopsy (that was fun) 11/17
Nocardia bacterial infection w/spread to brain (this is serious) 11/17
IV antibiotics 12/17-2/18
Oral antibiotics 3/18-12/18
Clear of cancer since surgery