I have sever pain, feel burning sensation and numbnesd on one side of my leg..difficulty walking properly ?

Many possibilities: Back pain with problems in the leg(s) can come from many things: disc problems, muscle spasms, spinal cord inflammation (rare), bone problems, etc. I generally recommend a thorough evaluation/examination by a doctor who sees lots of people with back and leg problems. That's a good first step; sometimes next steps include MRI scans, EMG tests, and such, but a good examination is important.