You might want to read the FAQ in the liverflush forum.
It might be a congested liver. Indeed gallbladder problems can have a lot of different symptoms. I have felt like regular sick and/or collar bone, shoulder and upper back pain.
If you don't feel well dissolve 1 tbs Epsom Salts (=magnesium sulfate) in a glass of water (I start with some hot water and add cold later) after you drink it and you feel relieve in 15-20 minutes you might look into liverflushing for congested liver/gallbladder.
You can also read about it on Ask Dr.Sutter's forum.