What Causes Pain And Pricking Sensation In Stomach?

I HAVE BEEN HAVING PAIN ON THE RIGHT SIDE ORF MY STOMACH FOR A WHILE NOW AND IT FEEL LIKE NEEDLE STICKING IN ME . IM KIND OF SCARED SOMETHINGS WRONG INSIDE . IT LAST FOR MOST OF THE NIGHT WHEN IT STARTS, I JUST PUT THE HEATING PAD ON IT BUT IT DOSENT HELP.