i am 53 years old and have had those same symptoms since my early 20,s flat ,sometimes small cat like stool, light in color .some times diarrea, then contipation , feels like i have go to the bathroom bad and only a drop ,comes out.but the other symptons that seem to go with this is protititis irritable urination . all of the symptoms will go away for 6 months or more and the return and last for about a month. i have good insurance so i have had all kinds of test by urolagist, gastologist,. i was told it was a nerve. i get better with a chiropractor work up. the other ting is i was born with minor scoliosis ,abnormal curve of the spine, that cause pinch nerve from time to time. i have had a colonoscophy, my psa for prostate is perfect,but i am still concerned