Unexplained bleeding from bowel?

Kind of gross I'm sorry but I'm running out of ideas. Since I had my baby nearly 3 years ago I have been suffering on and off from bleeding from the bowel. It comes and goes (always seems to go when I get to the specialists office :\) and nobody has been able to give me a reason for it. I used haemmorrhoid ointments for nearly two years with no success and have had a colonoscopy performed with clear results. I might get a couple of episodes in close proximity then it could be weeks to months before it happens again. Has happened at least a dozen times or more It is bright red, there is alot of it, as much as you'd see with a heavy period, only bleeds when I use my bowel and doesn't hurt. I have also suffered pain in the right of my abdomen for the same length of time along with a funny popping feeling in the same area this isn't always happening in conjunction with the bleeding but usually is around the same time. Have run out of ideas and wonder if anybody here has anything useful to add that perhaps I or my doctors haven't considered? Much appreciated