Good luck with the recovery. Sounds like you took a good beating. I think a lot of people can relate to what you have been through, maybe not to the same extent as your injuries though. I had my right knee re-constructed back a while ago followed by a 6 month rehab. I also hit a tree airborne at about 30 mph while skiing a while back too, but somehow only hit the soft part of my back, instead of my spine. I was amazed that I walked away from that. Or rather limped away. I also spent a month of my life seeing doctors to see if I had cancer. That was not fun. So there are plenty of dark days in life.
Nowadays, anytime that I can see the sun rise or go hike a mountain, I am very happy. It reminds me of a quote from Good Will Hunting. It goes something like. "You'll have good times in life and bad times in life. But the bad times will wake you up to the good things that you took weren't paying attention to." I think that sums it up. I was a jaded young adult before life happened to me. Life is what happens when you're busy making other plans. Now I am grateful for everything. So, things may seem a little dark, but without the darkness, there cannot be light. A little ying-yang. I remember walking or running or skiing for the first time months after my knee surgery, and those were much more rewarding than any run then i had ever been on before. I would never want bad things to happen to me again, but i would not change things if I could go back and make things different. So keep your head up, things are only going to get better.