Aside from mmj I know ice packs on lower back can help. From my experience it's an inflammation problem that puts pressure on the nerve. I would guess something high in CBD to help with pain and inflammation
800 mg of Ibuprophen(total daily) and couple rips of Fruity Chronic Juice. 10% Sativa 90% indica. THC 17% CBD total .38% CBG total .42%(rips when needed)