Thank you for your comments.
I'm not a doctor or anything, but sometimes when I have gas pains, I will also get a squeezing pain in my shoulder. I first thought it was a heart attack (except I wasn't having chest pains), but a doctor once told me it was called "referred pain", where something can be going on in one part of your body, but you will feel pain elsewhere. When I get these pains I will lay on my stomach and after burping I will feel much better. Just a thought!
Dear Tom,
This pain is likely from your stomach and the arm pain may be referred pain from your stomach as well.
However, i would menntion this to your internist to have these symptoms fully evaluated.