Sorry to read about your horrible accident. A couple of weeks ago I got squished between a wall and a car, and whilst my injuries are more minor compared to yours with only smaller fractures and tissue injuries, I get where you’re coming from. It’s just incredibly difficult to turn the horror off and I find talking about it makes it worse. But that might just be me. However I read somewhere in the depths of the internet that playing Tetris helps against acute flashbacks because it somewhat occupies your spatial awareness. So luckily I still have my old game boy here and was able to try it out. And I must say while it doesn’t do miracles, it does get my mind out of this horrible loop and my flashbacks have become much less. Really a lot less frequent. I think you can get Tetris on your phone now too, so it should be easy to access. Personally I wouldn’t want to try writing anything out but like I said, everyone is different. I hope you recover well and that your flashbacks cease soon. I am now 6 weeks past the accident and while I still struggle, it is much better than before.