I've Been Experiencing An Almost Crippling Pain In My Mid

I've been experiencing an almost crippling pain in my mid back on the RH side, just below my rib cage. It can be so intense that it feels like I'm being stabbed and can't catch my breath. I've previously had bladder issues and had to have my bladder repaired, tacked with a sling. I also had kidney stones, approx. 8 yrs ago.