Lower back pain numbness in right leg and right arm. Pins and needles in right arm down to fingertips. Please help.

Nerve impingement. can be caused by being sandwiched between two spinal bones, pressed by a bulging disc. It can cause muscle spasm and back pain and burning pain. This condition must be professionally managed. See an interventional pain management specialist for definitive diagnosis and management.
Complex. Could consider nerve compression in lower back causing your leg symptoms, and perhaps, peripheral nerve problem in arm at wrist or elbow. But could also wonder about neck problem causing spinal cord compression and explanation for both problems. See a neurologist and get this sorted out.