You can still try and be mindful about the feelings even when you can't control them, you can identify where they come from and if they are irrational with practice. Nothing is going to be a one stop solution and that's basically the premise of the quote even if said with terrible wording. I have ADHD and depression so I get where you are coming from but it doesn't detract from the lesson or what learning mindfulness can aid with. When you got into your crash I am sure your world was flipped and any of those feelings you had intensified, but it's important to note why and where those feelings are coming from if you want to move to a point of equilibrium. The feelings may never disappear but the levels at which you give them control over yourself can be managed so you can enjoy life faults and all. I implore you to look into mindfulness as someone who suffers from a couple different mental illnesses I can't recommend it enough as a means to become comfortable with your self. I hope this helps, and remember you got this shit. You been through a lot and still kicking so I'm fucking proud of you!