Hi,
Welcome to Neurotalk.
I have had 1 nerve block (a guanethidine nerve block) and it caused me to "lose my balance", my bad leg shoots out in front of me. I had my nerve block done whilst I was asleep (but most adults have theres done whilst they are awake) The best nerve blocks to have from what I have heard are Stellette Ganglion blocks and Epidurals
I hope these links help you:
Epidurals - http://www.rsdrx.com/rsdpuz4.0/puz_13.htm
Stellette ganglion - http://groups.msn.com/TheRSDNook/sgb.msnw
Most people have to return to their PM doctor when the pain comes back for another nerve block
Thanks