Hello there...my rsd came on so gradually that I didn't believe the doctors when they told me I had it. Everything I had read said it came on quickly. Mine was caused by a broken ankle. I have all the symptoms but they came on one at a time. I hope you will get some relief from your symptoms. Sorry I don't know anything about the type of block you need but please don't let anyone pressure you into doing something you are not comfortable with. Take Care.