* Your son wouldn't want you to spend your life in the cemetery. Think of your son when he was laughing or having fun. He'd want you to find a way to feel that way again.
* Even if you fight and win against the corporation, and win billions, this won't guarantee that this can never happen to another child again.
* It's not your sole responsibility to ensure this never happens to another child again. It is our shared responsibility as a community.
* Despite this being our shared responsibility, it will probably happen again somewhere, at some time in the future. Humans are not perfect, and we aren't omniscient.
* You will move on and you aren't betraying your son by being happy. You will eventually forget the exact sound of his voice, memories will fade and this is ok.
* You will never get over this loss, but you will find a way to be happy again.
I know it's possible because my grandmother lost a son in a very similar way.
My grandmother lost her eldest son when he was ten. He was also hit by a truck. Like you, she was in the cemetery for a year, kneeling in the snow, till the priest came out and told her that it was time to move on, which is what she did.
Unlike you, my grandmother who lived in a small rural village, wasn't offered a settlement, and didn't feel she had the option of consulting lawyers. In a way she had it easier because she had fewer choices.
I do know that my grandmother found her way to happiness again, even after later losing her husband to a grossly negligent medical error a few years later.
Again you have to implant this belief in yourself. You and your family can find your way back to happiness again. Even if it seems like a cruel joke, it isn't. It's true. And I know it's true because I know people who did it.
Now some actionable steps/ideas:
* Make a small space in your home as a shrine to your son. Stop going to the cemetery and spend time with him there instead. If he dwells anywhere it's in your own home, not in a cemetery.
* Find a job you can do from home. One you can do in your sleep. Even if it's just some remote work like two days a week.