I also came to that conclusion to find after a referral from my doc to the hospital specialsit and after many tests that my spinchter muscle is in fact too tight and does not relax enough. This condition is known as Anismus. Prior to these tests I also had bowel retraining as I to felt I was not releasing enough waste and had symptoms of fullness. But this only made my condition worse. I have so much to say on this subject as I too have suffered with this condition for 20 years but have found a few things that help a bit but do has not cured my problem.