This happens to mom who has severe COPD, she usually breaks or cracks a rib and it sounds like the same symptoms. I would go get it checked out.
DX: spinal fracture L5/S1, fusion 1/96, Spondylolethsis, DDD, nerve damage to both legs and bladder, 4/2007 anterior & posterior fusion L1-S1, 4 Bladder surgeries. Multipe injections, depression, PTSD
Meds: MS Contin 60mg bid, oxycodone 30mg tid, clonazapam 1mg bid, Pristiq 50mg.