One thing that I've noticed about gallbladder symptoms: everyone seems to be different. Some people hurt on their backs, some people feel like they are having a heartattack...some people get nauseous. It's the radiating pain that makes it hurt in diff spots. Since WLS makes us vulnerable to gall bladder issues, just keep that in mind.
However, if I remember correctly, you lift weights? My instinct tells me that maybe you pulled something? The sutures take months to dissolve.
Of course, as always, you should consult a doc if things get worse. I know that you know that i'm not a doc, am not pretending to be a doc, and am not giving you medical advice, just my theories. But others may think I am trying to play doc, so just setting things straight.