Thanks for writing in.
Pain radiating from back to abdomen is more likely to be renal colic
or biliary colic
. But as ultrasound
has come normal, those possibilities become zero.
Again hepatitis can cause raised liver enzymes but sever pain will not occur. Even cholecystitis
can cause similar pain.
I would recommend you to get CT Scan abdomen to rule out above conditions as ultrasound can miss few things.
I hope I have answered your query. Feel free to revert back for further clarification if required.