I just got this (sorry , I don't know how to format) chair pad. I have a desk job and my pain was getting bad. It hasn't gone away but im not in a ton of pain anymore. I love this thing enough that i actually left a review.
OK! My lower back pain was not gone but it was NOTICEABLY less. I didn't have to go home and support my back with a pile of pillows on the couch when I got home, I was perfectly comfortable standing while I chopped away and made yummy soup.
This is the one I got. Sorry I suck at formatting. I'm thinking about getting one for my car too. They aren't too expensive, or HEY! I could add it to my wishlist!
Earplugs, and most importantly, this: http://www.amazon.com/TravelMate-Orthopedic-Gel-enhanced-Medium-Firm-Comfort/dp/B00J4VIN1O
My ass hurt for months after the flight back the US from Paris, and it was mainly because the seats on planes are not designed AT ALL for comfort on extended flights.