I had sciatica before. I have therapy back home for weeks. I will advise to do the same thing, but don't pay as you can do it at home.

Do the hot water or towel therapy and every morning when you get up, pull your legs up towards your chest and other leg exercises. It has helped me a lot and I dont suffer it anymore.

Mine was already at its worst when I discovered it. I could hardly move anymore, could not lie down for long, nor sit! I was in terrible pain