Keep waking up on my back! Help!

Jessica
I have always been a side sleeper and all of a sudden, I feel so comfortable sleeping on my back. I fall asleep on my side with tons of pillows and find a way to get on my back throughout the night. I know that's really bad so we got a pillow similar to the one pictured above! It helped a little but I still manage to wake up on my back. I'm not sure what to do. My back is killing me and I need your suggestions ladies! Anyone have a similar experience?