Sciatic nerve pain

Claire
So a few months back I hurt myself at work and had pain in my hip and lower back I couldn't bend over ever since then Iv had nothing but dramas with my back and Wednesday at work I left and went to the shops was walking around and my foot started hurting everytime I took a step since then it's been agony the pain goes from my hip right down to the side of my foot. Iv even been getting calf cramps of a night . Any ideas on how to help it