Yes upper backpain is gallbladder and aLSO TIGHTNES AROUND THE Front.
To test your self have a glass with 1tbs Epsom Salts and if the pain gets less you know for sure it is the gallbladder. You can try it twice and other wise do a flush. The ES is not a cure.
I sometimes have pain in the collarbone and that goes away with ES too. Gallbladder has many reflex points in the body and it is not always easy to tell in the beginning that it is the gallbladder.