My back is the worst, twenty years of recurring bouts of sciatica until I started taking two of these every day:
http://www.puritan.com/antioxidants-...-800-mg-051441
It's a low dose anti-inflammatory. Since I stated taking it 3 years ago when I've had back pain flare ups they've lasted only a third as long as before, and I haven't had any sciatica. I used to have to take up to six Vicodin a day for relief. I haven't had to take any since going on the turmeric. Being low dose it takes about a month to fully kick in.
I routinely drive four to six hours with my standard seat, no issue at all.