Injuries And DOT Physical

I'm still driving after suffering back problems. I guess I was about 20 years in, when I had to have a diskectomy on L4 and L5 vertebra. Then I'd say three or four years after that, I had to have a spinal fusion on L3 L4 and L5. And then approximately 2 years after that I had another Fusion on C4 C5 and C6. I was fortunate enough to have a good surgeon, and I'm really pretty much pain free unless I sit too long. The bad part about a spinal column injury, from what I understand and my own experience. It just keeps getting worse.