Lumbar Sympathtic block, usually for lower back. I had a SGB, Stellate ganglion block which is injected in your neck for arm/shoulder RSD. Personally, the block seemed to produce a reaction to me. Stiff neck, swollen jaw, swollen gums and tongue and a horrific headache and low grade fever. It was not a good experience! I would certainly give the injection a try after speaking with your dr. Seems they do help some patients. I feel after mine, my neck still bothers me even though before the block my neck was never an issue. I also feel it heightened other symptoms that were gone and now they are back. I feel it spread to my neck, chest and my lower back too. This past week or so, my knees are so painful it's unbearable. Pain meds are not good to take everyday but something like Lyrica etc to try to ease the pain so we can kind of feel normal. I hope it helps you!