Make sure you do not sleep on your stomach. Best to sleep on your side with a pillow between your knees (will help keep your spine aligned). This worked wonders for me.
Sleep with a pillow between your leg. It helps relieve the pressure on low back. You may also want to check into a good mattress topper. I love mine. Have you had your back checked to see what is causing all the pain? Best wishes.
Sissie