The nerve block would probably be to see if the pain goes away; as it sometimes will for migraines with that sort of treatment. Sounds like he's trying to rule out migraines through trying the treatment, and he also may very well be trying to get you out of pain the way he thinks is best .

Sorry that you have such a situation with the neuro. We have the same silly waiting system here in Canada...although we can choose our specialists (neuro). It just depends on how long one is willing to wait. It can be over 2 years to see one that specializes in a particular area within neurology like MS.
Can you be put on a waiting list for another neuro?

With love, Erika