Re: Phantom Nerve Pain
The medication is routinely used to "bathe" the nerves and surrounding tissue, so unless there was something very unique about your experience, I think it is highly unlikely that the medication is to blame.
The needle could strike a nerve -- it is technically possible, but it would not explain the pain in your fingers...unless they were injecting cervical facet joints...in which case it would not be affecting your legs or feet. And it would be exceedingly rare to have permanent damage for this type of nerve injury.
If you are really interested in tracking this down, I would suggest you make an appointment with a neurologist. He/she may want to run a nerve conduction test to try to identify which nerves are causing the problem.