@jcmacqueen
I have to be careful here and want you to know this information came from my R/O and team at UFHPTI.

They would not do the radiation treatments unless I had had a colonoscopy within a year. The reason is that the radiation can cause damage to your colon and having a colonoscopy after radiation was not advised.

I just wanted to pass this along and suggest you talk to your colonoscopy specialist about this.

I think your Space/Oar movement may have added (but just a feeling) to your colon being radiation. The time frame for bleeding told to me was not until some time had passed. What I was told was that the small blood vessels can be damaged during radiation in colon. They will die and new vessels are formed. When the new vessels are formed they are vulnerable and can be easily damaged and bleeding will occur.

Thus, the extended time frame for this is not right after radiation but later on. The new blood vessels will eventually become stronger, and the bleeding stops but this takes time. Again, this is not my information but from my radiation treatment team.

Please check on having a colonoscopy after you have had radiation and also you are having bleeding. If the colonoscopy is to address the bleeding probably you have told them about radiation, and they are trying to get the bleeding stopped. But I mentioned is just as a precaution.
GOOD LUCK!!