I have been having left shoulder blade pain for 2 weeks.any ideas what it could be?

I have had a colonoscopy,an upper gi scan,labs up the yazoo,chest x-ray,and a CT, which I haven't got the results from yet.I have been told that it may be my gall bladder,but that my gall bladder is still functioning, just "lazy."Whatever it is, I am miserable and would really like some answers, HELP!!!! i have also had an EKG that shows that my heart is normal for a person my age.