Yeah, can see that you are suffering from one of the most wicked
pain of all... neural... Well, according to what I usually heard
from any specialist irregardless of any field, they would go for
Tramadol (those local analgesics) that you are having to arrest the
pain, but seemingly such analgesics take a rather long time to have
an effect.
Local corticosteroid injection is definitely out of the question
since you will only get that done by a GP or an orthopedist, and I
guess that goes for the opiate groups as well.
May I suggest one of those group of medications that combines the
paracetamol together with codeine as it has a two way effect in
inhibiting pain, though it may be rather habit-forming, but I think
it's the best bet you can get... Vicodin... 
