There are other people around who probably know more about this than I do but they may not show up today as its Sunday. I'm always more confortable in starting conservatively which in your case would be PT, I've had it a couple of times, the last for cervical radiculopathy, and the PTs really know what they are doing. Maybe they can help but even if they cant its possible they could add information that would help define appropriate next step treatment.

I'd be a little confused about the nerve block as well, I don't know if it would make things worse or if it would 'release' the foot drop and help. Maybe someone else will post who has an idea. Did you google 'nerve block foot drop"?

I hope you find some answers.

judi