How can I get my son to appreciate being alive

My 15 year old and I almost died in a horrible car accident. Someone hit us and our car fell over the guard rail and flipped 3x. We were in the hospitals for weeks. I broke my arm and needed stitches in several places. My son had the most damage because they hit his side. He actually died but thank the lord they brought him back. My son is paralyzed waste down.. It has been 11 months since the accident. We've healed okay. My son is just depressed and angry. He now needs around the clock care. He can feed himself by sometimes his arm get shocking pain and I feed him. I bathe him and since he's wheel chair bound and didn't want a catheter he uses adult diapers and I change him. So I take care of my 24/7. It's been almost a year and his anger and depression towards the situation hasn't gotten any better. How I see it we are so lucky to be alive. I keep telling him he died and they brought him back and how lucky he is but he just helps that he wishes he died. I explain lots of teens his age are wheel.chair bound but he just said.h doesn't fucking care and ignored me all day. I don't want him to feel so upset and bitter forever. It's been almost a year.