If you have a pain in your abdomen, you should probably go see a docteor, as you may have a ruptured appendix.
The appendix has no known use, so if you're told you need to have it taken out, you're...
Normally I would suspect a kidney stone as the source of pain in the lower right abdomen, but that would not account for the additional pain in the underarm . Honestly, I think you should be examined...