I have really bad back pain and what can I do to make it go away?

See a doctor. You need a good evaluation. It could be a problem with your back, your posture, your weight, your feet or legs. There are many different reasons, but without knowing the cause, it can't be treated.
Evaluate . the first step in treating back pain is to get a diagnosis. Most is benign and self limited. Others are difficult to treat. See you physician for an evaluation .