I have been diagnosed with CIDP since October, 2013. When I was first diagnosed, the "binder" feeling around my abdomen was one of my biggest complaints. It worsened whenever I was driving in the car and had a seat belt on. It isn't so much painful as it is disturbing because it does make taking a deep breath difficult. I found that rubbing out the abdominal muscle helped a lot. The feeling comes and goes and I can't say if anything except maybe stress makes it worse. I have had GI tests including a CT scan of my abdomen done because I was certain there was something in the abdomen tightening it up, but all the tests came out negative. My GI doc thinks it's the nerve issue stimulating the abdominal muscles to contract and stiffen up. I have had IVIG treatments two days/week first every 4 weeks then every 3 weeks and the feeling still persisted. I don't think the IVIG helped it at all, although I don't feel it all the time. Again, if it really bothers you, try changing positions, move about, sit straight up, and massage out the abdomen. I have read about this issue happening in people with multiple sclerosis and maybe the mechanism is similar. Just make sure you tell your doctor about it.