Well... this might be a bit small minded or petty, but at the moment I am fantasizing about writing letters to some of the docs that gave me especially bad care. I'm not writing to the ones that just didn't have a clue, but the ones that should have known better and still gave me harmful advice. I am even thinking about reporting them to the board of medicine.
On the other hand, I also try to notice when my anger gets too out of hand and unhealthy and then acknowledge that to myself. It doesn't make the anger just magically go away, but it lets me use techniques like meditation or binge watching something until it passes. Because it does pass or at least decrease if I stop fueling it. Then I can make a decision about how I really want to handle the injustice, which I always find is better when not blinded by rage!.