If it's primarily under you right rib cage, it's probably your gallbladder. I had several attacks before I gave in and went to the ER. The one that got me in was one like you're describing. The others didn't make any difference in pain when I took a breath, but this one hurt so bad when I would take a deep breath that I felt like my ribs were going to shoot out my side...ala Wolverine on the X-Men?? No other way to describe it, sorry.....felt like being waffle stomped by a clydesdale.

Go get it checked. If you can, wait till you're not in a lot of pain because they'll do an ultrasound to see if you have stones and if you're having an attack, it's quite painful....trust me! I had to shots of demerol and still wanted to kill the tech for digging around in my ribs! Not a pleasant feeling. Before letting them take it out, if that's the problem, look up a gallbladder cleanse. I didn't and wish I had.

Many people have weight problems and bowel problems after having it out and once it's gone it's too late. So do some checking before they do anything, unless it's life-threatening...which most are not. Good luck, hope it at least points you in the right direction.