After working many hours, I had to stop a few days because I got crippling sciatic pain in my lower back, hips, posterior and my legs. I could not stand, walk or sit down for a few seconds at a time. Only laying down.

Has anyone had to deal with this? What kind of body pain have you had to deal with while driving long hours? How have you managed it? How often do you get out of the car and take breaks? Anybody take walks or use a seat cushion?

2017 Nissan Sentra. I feel like the way my seat is designed makes it impossible to drive long hours without injuring myself. It's tilted from the knees down to the butt, where it sinks deeper. It's pretty low to the ground. Raising it higher doesn't raise the butt part of it much. If I pull the seat further from the wheel, I can't reach it. But my thighs practically don't touch the seat and my knees go up to the steering wheel. I can't sit with my knees at 90 degrees because if I adjust the seat that high up, it's too high and I'm about to hit the ceiling/the rearview mirror doesn't adjust higher. I'm not even tall, I'm 5 foot 10 inches. Tilting the back part of the seat back is the only thing that's helped me so far.

Please help.