When sleeping on my stomach my ribs begin to hurt and i get extreme lower back pain that makes my stomach sick. any idea why?

Your weight?: If you have difficulty sleeping on your stomach, making it difficult for you to breath, straightening of your lower back causing discomfort, laxed lower esophageal sphincter tone, with a little reflux. I would recommend avoiding chocolate which relaxes cardiac sphincter-valve between stomach and esophagus and allows reflux) and sleeping on your back.

Many factors : Not sure. This is an unusual constellation of symptoms. I would suspect that this might be a postural issue. I would need more information to answer your question accurately. Are you obese? What kind of work do you do?