My middle upper back hurts

[MetZleRmaN]

I don't know exactly what in my middle upper back is hurting, but it is stopping my weightlifting and is hurting my progress. I've stopped lifting for 2 weeks, but every morning it still hurts. It also hurts particularly when I lift up my backpack.
Also, I do not think it is a bone or joint issue, because I already went to the chiropractor and it did nothing.