Cheer up, when I was much, much younger, I had very severe pain from my hip down my leg and into the calf. I could not find a place to sit or lay down to relieve the pain. I stepped up the stairs from my garage into my kitchin and suddenly, the leg collapsed, and I could hardly get back up off the floor. Fortunately my daughter was here and she took me directly to the doctors office because we both thought I had had a stroke. Well, good news. I had Sciatic Nerve pain. The doctor told me to rest the best I could and gave me pain med's and hope it would go away. A friend suggested that I begin to take B 12 because B 12 has some connection to our Nervous System. I bought the 12 hour release version of B 12, and within about a month the pain was gone and I have never had a subsequent attack.

I do not wish to influenze your treatment, as we both know, Your Doctor is a lot more intellegent than me and knows a lot more about your Nervous System, but it is one of those things (that just might help) and I don't think there is any down side, but check with your doctor before trying.
PS My son visited New Zealand when he was about 20 years old as a guest of the New Zealand Civil Air Patrol. He loved your country and siad if he ever left the United States, he would love to live there.
Gina5009