Are you suffering from neckahe, backache? In especially when you are driving or been driving for a while?
Car seats are not tailormade to you size, unless we are talking about hypercars where you get to have your own customised seats! Hence, the seats are causing you pain from long term. You would realise there are always gap in between your lower back to the seat (even they have lumbar supports). Thus, there isn't any support on your back whilst you are driving, causing fatigue and tireness.
Appropriate neck pillow and back pillow can provide stable and comfortable support, so that you can sit comfortably as well as passengers!