Oh great, a totally embarassing topic to write about! I just went through a similar experience. Since I did, and it went OK, maybe it might help to post this.

I had similar problems for some time which I eventually and reluctantly addressed. It's not so bad if they knock you out. One moment you are aware, then you are out like a light, and then you wake up and say "What happened?"

I still wonder if mercury can cause bleeding, but my colonoscopy yielded no problems according to the doctor. Although I do have diverticulosis, which is small pockets, but not inflamed, and does not seem to be a problem like diverticulitus.

If the blood is bright red, it is likely to be hemorrhoids.
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Hope this helps Nina.

TW