I Have Suffered With Sciatica For Several Years But It

I have suffered with sciatica for several years but it got worse after my accident five years ago. Now when it hits me the pain is so bad at times that it wakes me from a sound sleep. What are some ways that I can relieve the pain, especially at night when I am trying to sleep. I take flexible and oxycondon for the injury to my arm but it doesn't seem to help the pain in my back or that that radiates all the way to my ankle.