Hello anda tardy Welcome to our Pain Management Forum.
I'm so sorry to hear about your son. Sadly his response to a Cholecystectomy (gallbladder removal) is not a rare occurrence. Sorry!
As far as I can tell Sarsi has not been active on MedHelp since January of 2014. We do have a Gallbladder Community that may be helpful for you. Here's the link:
http://www.medhelp.org/forums/Gallbladder/show/1208
Although your post does not say, I'm assuming the medical providers are thinking your son may be developing early adhesions from the Cholecystectomy (gallbladder removal)?? Is that so?
Gabapentin was originally designed to treat seizure disorders however it was found to be effective in treating Neuropathic (nerve) pain. People with adhesions often experience pain from nerve entrapment within the adhesion. Gabapentin or Lyrica can be effective in treating Neuropathic pain. However it may be a bit early to discuss adhesions.
Just for future information that while it is true that most imaging is not considered a good diagnostic tool for adhesions there is an option. Some years ago a Cine-magnetic Resonance Imaging (MRI) was found to locate many of the Intra-Abdominal Adhesions that laparoscopic surgery discovered. This may not be done every where but I think it is worth consideration.
Does your son have symptoms of post-cholecystectomy syndrome? This occurs in about one in seven people post-op.
I wish you and your son the very best. He's fortunate to have your love and caring nature. If you have additional questions of us - or just want to provide an update we'd be happy to hear from you again.
Best of Luck,
~Tuck