late night pain

So for the past week or so I've been getting these horrendous pains at night. It starts when I "retire" for the night and sit/lounge on the couch. I find out when I go to move/reposition/get up I'm in really bad pain around my stomach. It hurts to get up, to move..to sit up straight. I also get it in the middle of the night when I wake up to pee or roll over and I can barely move.