From my understanding, and experience, bright red blood, when you wipe or even in stool is from near the rectum, (i.e. bleeding hemorhoids, rectal tear) as opposed to more internal bleeding. I experience this quite often, and once I had probably a strong tablespoon of blod after some major stomach cramping and BM. I headed for the ER, I bled more while there. After a rectal exam they told me it was nothing to be concerned with. While I don't xactly agree with the comment, I don't get overly concerned now, just more careful. Lubrication and gentle cleaning. I still experience it under certain conditions. I have not had any surgery so most of my bleeding is related to hemorhoids, and tearing or scouring of the colon/rectal area.
Regarding the cramping, check out some of my responses in the IBS forums. I have had fabulous success at eliminating them without medication.