Sorry you are experiencing this and the worry that comes with it. I didn't have any symptoms except some bleeding when pooping. There are a few things, mostly benign, that could be causing your symptoms. Best to talk to a doctor soon. They may be able to diagnose digitally or with a scope before suggesting a colonoscopy. No need to worry yet, just need to check it out. Hoping you have some peace of mind or at least clarity soon. This is scary stuff, but one step at a time is definitely the way to go.