How can I stop or relieve back spasms?

I have chronic back pain along with nightly back spasms ( the spasms are so bad I will jerk like I'm being punched ) I would like to try and find a way to relieve my symptoms without having to take medicine. I've been diagnosed with degenerative disc and a bulging disc in my lower back and have bone growths on my upper spinal column. Any suggestions on relieve would be great, I have been to a doctor but with no insurance that gets kinda expensive.