Just wrote a reply but don't see it. Just wanted to add that I also take ClonazaPAM for anxiety and spasms I get out of the blue anywhere from my side, to my abdomen, to my esophagus...just anywhere...any time.

Wow, symptoms sound like mine. I take Clonazepam for sleep due to Fibro, but I get frequent side, upper abdomen and back spasms that are horrific. Am told the connective tissue between the ribs and chest wall pain is called costachrondroitis. It's a real beaut!