I've been in pain with my lower abdomen all week. The pain doesn't change with the food I eat. I seem to do ok if I'm standing, but if I'm sitting or laying down I feel the pain increase. If I chuckle/laugh the pain is enormous. Any ideas?

Optional Information:
Male

Already Tried:
I was x-rayed at the E.R., four vials of blood drawn, urine sample taken and a ct scan conducted and several hours of waiting for the results. They couldn't find anything wrong and didn't have an answer for the pain in my abdomen. They referred me back to my doctor to see if he could find an answer