Had sciatica for 20+years and nothing seemed to help. In hope more than anything else my GP referred me to a surgical consultant at PMH Swindon who recommended a "Caudal Epidural". Basically this is an injection of anti- inflammatories, under general anesthetic, into the lower coccyx.
Not sore in any way and all done and dusted in 20 mins. Result ....no pain for over a year (fingers crossed that it lasts).
It worked for me
3P