Can you tell me how i can sleep with a freaking sore back ?

Fix the back: Trying to use meds or other treatments to fall or stay asleep when the problem is back pain will fail. Better to see a pain clinic for a good evaluation and treatment plan to resolve that issue. If the bed is causing the back pain, consider flipping the mattress or placing a 1/2inch plywood board under the mattress for support.

Sore back: In addition to the other good advice you received, if this is a chronic condition, please do a search for John Sarno, MD. He has a mind-body approach to pain coming from physical issues. One of his books is "The Divided Mind." Peace and good health.