What Causes A Moving Sensation In The Lower Abdomen Area?

Hai , i have had some thing moving my in body esp in areas of lower abdomen and slightly upper right side of my lungs since 2008, i have gone for 4 scans in different hospitals, no clear report is given to me, now i feel pain wen i sleep lying on right hand side. i feel some thing is stack some where in side no more movement, what could that be? or what tests should take to find out what is?