I have had sciatica very badly in the past and using my private medical insurance went to Osteopaths and Physio's but they naver really cured it. I was sent to a Neuro surgion who did an MRI and took Xrays and found nothing significant. At the time I wished he had, as at least there would be an expanation for all this pain.
So, I just started to do soem very gentle exercises for the back that I came accross on the internet if you a google search for Sciatica and over time - about 9 months I was completely pain free and able to do all the normal things that I'd done before.
The exercises were basically strething of the bottom and back of the leg muscles and strengthening the stomach muscles. I followed these very gentlr exercises religiousley and have not looked back.
I'm glad I didn't have to pay for all the treatment that I'd had done on me by the osteoa dn physio, because in my case, they didn't fix it. It was the exercises!
Hope this helps!