You should go to the emergency room if the pain is unbearable and you aren't pooping or able to eat. I don't think a flare should hurt that bad without other symptoms. If its a pinching burning kind of pain that comes in waves its probably an adhesion. I had problems with them before I had laproscopic surgery to remove them. My doctors indicated that they tend to get bad 3-5 years after having surgery. My doctors sounded nicer and gave me a small number of morphine pills to take if the pain got bad (they also slow down your intestinal contractions). Also, I think its very likely they can miss a blockage. I had tons of adhesions and none showed up on CTs or X-rays and blockages will only show up if they are very severe.