Have you seen your GI doctor regarding this? As you know pain is a symptom, so see your GI and go from there. Get several opinions if need be, it took 4 to get my son diagnosed properly. Take care.
I have had several abdominal and intestinal surgeries. If they have ruled out anything going on with your GI tract it could be adhesions or abdominal wall pain. I have both. Abdominal wall pain can happen after surgeries and unfortunately is just a chronic condition. Mine seems to come with my fibromyalgia flares so I think it is because it is a muscle. Adhesions often form after surgeries. Take a look at the health pages attached to the Ovarian Cyst forum on a great posting on how to deal with them using ball rolling (I bought the Yamuna ball rolling kit). As well, a massage therapist skilled in myofascial release can help.