When I breathe my back gets a bad sharp pain I cant lay down properly what do you think is wrong? I need to know it is really painful.

See a doctor . In this case, there is no substitute for a physical exam. .
See Dr. For excruciating pain that does not go away, there's no need to suffer, call 911 to get pain relief and an evaluation immediately. If the pain is severe, but tolerable, make an appointment with your primary doctor as soon as possible. There are too many questions to ask and a physical exam needs to be done to be able to figure out what's wrong. It could be something dangerous.