Well before we can answer your question fully you need to provide the following details :
1. what does the ultrasound
of abdomen say
2. Please give the complete Liver
function test- bilirubin
, ALT, AST, ALP - this would be mentioned in your report - if not please get a complete LFT done.
The pain seems to be like a biliary colic
. If he has stones in his gall bladder- he would require surgery to have the GB removed- otherwise we can manage conservatively.