I've had 2 bouts of sciatica. Both times I had shooting pain down my leg and my hamstring was so tight, it would become difficult to walk or stand for very long. The first time, I started with conservative treatments including physical therapy sessions, which would help for a few days then gradually start getting worse again. 2 days before my last scheduled pt session, while doing a leg lunge, something popped back into place in my back and I was as good as new. About 1 year later, the sciatica pain started again. This time, along with the pt exercises I had learned the year before I was going to the Dr. for manipulation (probably the same type a chiropractor would do). This would help for a few days then gradully worsen. A week in WDW aggravated the condition and I went from intermittent pain to non-stop pain. A MRI showed I had a herniated disc. I ended up at an orthopaedic surgeon and his recommendation, because I had already tried all the more conservative methods, was surgery. After talking it over with my dh, who kindly reminded that I had been in constant pain for almost 1 month straight, I bite the bullet and agreed to the surgery. Within 4 hours of surgery, I was up on my feet and walking without pain (smiley face here, if I knew how to insert one).
Sorry to bore you with details, hopefully the chiropractic sessions will work for you. See if you can get some exercises to do as well. You can look online or get a book from the library with exercises for your back.
Good luck!