Do you have a lot of pain right away or is there some little inkling that happens for a while and then it builds up to more intense pain?
Also, where exactly is the pain? Near the middle of the chest? On the right side under the rib?
extremem pain pretty soon after eating a meal with ( oarticularly a lot of ) fat in it. the gall bladder secretes bile to digest the fat and it is the waves of contraction against the stone that cause the pain. you are about right with the positions of pain