What can one do against sciatica?

I had experience that during my 3rd trismeter and it was horrible. The pain would randomly came and it hit hard. I had to stand really still and lean back on a wall/or someone to have a little support. At home, I got my ex-husband to press a warm compress to the spot and regularly massage it. It seems to help but the pain would still come although it wasn't as bad as before. http://www.spine-health.com/conditions/sciatica/what-you-need-know-about-sciatica