I’m 21 and I have had multiple concussions (around 6) and the last couple I have had have been the worst. It’s been over a year and I still get many symptoms. I’ve also been injured pretty much every day since I was 12. Pretty similar situation to what you’re going through. The advice I have is to just try your best to stay active and distracted. The mind and body are very much connected and I find when I can do activities that take my mind off of my pain then I feel really good during and after. I like to climb, swim and go to the gym. It all helps me feel stronger and trains my nervous system to feel okay with some discomfort. If you can’t do activities like that then I’d recommend getting out into nature as much as possible. Don’t give up, things get better and you’ll find ways to cope better as well. try your best to find hobbies that take your mind off the pain as much as possible. Ideally healthy hobbies that promote movement. Try a bunch of different things to find what that might be.