I have had steroid injections for lower back pain my next thing being done is medrial blocks diognostics then possible nerve burning what can be done ?

First, you need an : Appropriate evaluation and diagnosis rather than trying various pain management techniques to see if they help. Most back issues are treated non operatively and without any invasive techniques. Start by evaluating your lifestyle in terms of weight, not smoking and regular exercise including flexibility, core strength and cardio routines. There are a variety of medication options as well.