sleepless nights

I have never in my life had a problem falling asleep at night. I have always slept on my stomach. Well this past week and a half I have not been able to fall asleep at all. I have taken melatonin, and even Benadryl to help me sleep and nothing is working. When laying in my stomach, it feels like I'm laying on a yoga ball, if that makes sense. When I lay on my back my stomach hurts, like a dull crampy pain.