My Doctor Wants To Do Facet Joint Injections. Neck Area.

My doctor wants to do facet joint injections. Neck area. 3 on each side. Total of 6. About 2 months ago they did a single into the fluid region. No relief. What the percent that these inj. will or will not help. Diagnosed with Neuro Mylitis Optica 16 years ago. Drs seem to believe this is fibromyalgia pain? I suffer from extreme nerve pain, muscle and joint pain and a host of other!