Bok, your gallbladder and liver are on your right hand side.
To know if it is your gallbladder, when u have the pain, lie down, and just gently push under your ribs,,,,,,if it is the gallbladder,,, you WILL know, as the pain will nealry lift you off the bed.
Sounds though like your poor body is as you said, just suffering from being in a chair all day
I really hope that you can alleviate the pain hun, but still keep your job as long as you wish to.