Past 2 days mild upper abdomen pain, mild diarrhea, pain in upper back- mostly shoulder blades, on and off nausea. what could this be?

?virus: This constellation of symptoms could occur with a viral gastroenteritis but a gall bladder problem is also a possibility. Have your physician examine you if symptoms persist or worsen. In the meantime follow a bland diet and drink flat ginger ale to see if symptoms resolve.

Possible virus..: Most possible reason for symptoms especially because they are mild is a viral syndrome. Also if you happen to be sexually active you should also check for pregnancy. Other reasons: indigestion, urinary tract infection especially if you have urinary symptoms. In any case of those do not resolve in any few days go and get checked oath your PCP.