well,all i can say is this,,,,i have the EXACT SAME THING,YOUR NOT ALONE!!!
mine does the exact same thing,in the same place and radiates to my back also.
i have had mine now for 9 years!!!
sometimes i dont get it for months at a time,sometimes i get it like 1 time a day for a week straight!!!
ive had every test too you can think of,,,ruled out gallbladder,hernia,pancreas,liver,ulcer,cancer,heart,,,all the bad stuff.
i do not get sick with it,just the pain.
i have not lost weight from it.
i guess after 9 years if it was going to kill me it would have done so!,,,but i know what you mean,it is a bad pain,,and feels like it comes from inside,not on the surface.
all i can say is hang in there,and if you EVER FIND OUT WHAT YOUR PROBLEM IS,PLEASE REMEMBER ME,AND LET ME KNOW,,,IM SURE IT IS ONE IN THE SAME!!!!!