I have had a stabbing pain in my upper abdominal area that was very severe for 2 days. Now it is only on occasion and not as severe. Last night I started getting a very heavy feeling in my left shoulder area. Today I can barely lift my left arm above my head. My stomach is still crampy. Could these symptoms be related? If so, should I see my doctor?

Yes, you should see your doctor, we cannot diagnose on the internet for obvious reasons and they are, we don't know your medical history or you personally.

Left side, heart! Of course you be seen, and soon. Clot moving, who knows?