I have diaphragm tightness that is constant. It goes from the belly button up to around the nipples. The tightness is around my whole core. Has anyone else dealt with this, muscle relaxers don’t work, clonazepam just Barely works a little. Does anyone do any exercises or stretching that helps. I do appreciate all the help I can get.. By the way I have a cervical fusion at C 1. C 2 Take care and God bless.