Tips for easing back pain during labor
First thing you should try is getting on your hands and knees. You can do this in bed or on the floor, which ever is more comfortable. Getting on your hands and knees will allow gravity to help move the baby into a better position and get the baby off your back.
You can also try getting in the open knee chest position; your chest, head and arms resting on the floor, your knees on the ground with your butt in the air. This can help move the baby out of a bad position and ease the pain of back labor.
When you get back up don't lay on your back, stay upright, walk around, sway back and fourth, etc. Have your partner massage your back, try hot or cold, and try a bath.