I have pain and spasms under my right rib cage that are almost unbearable. I can barely move at times, like when standing up or using the muscles in that area. I could be completely still and all of the sudden get a spasm, or a feeling that something is tightening terribly, and then it releases....but its hard to even move at all at times. This has happened before and went away within a couple of days, but the pain is so bad I am worried of what this may be.