Yep, back pain, discomfort, cramping are all part of the recovery. My back hurt horribly after surgery. I think it is caused by a combination of things... when your belly has had surgery, you tend to overcompensate for the stomach issues and walk, sit, lay differently causing the back muscles to freak out; also the surgery itself can cause back issues due to the hard, cold surgical table. It will get better. Keep using the heat and tylenol or pain killers to get thru it. By no means, do Not stop moving and walking. That really does help to work the soreness out.
I'm sure others have experienced the same thing and will chime in with their thoughts and remedies.
Take care and keep your chin up. You Are Healing. Be patient with yourself and enjoy being disease free and eating again!
Diagnosed with CD in 1979, many resections and meds
Perm Ileostomy July 1984 at Cleveland Clinic
Disease free since surgery