Old injury, worsening symptoms

[aesthet]

I suffered a series of concussions/TBI when I was 13 and then another TBI when I was 18 from sports. I am now 26 and find myself struggling with severely worsening symptoms. Chronic headaches, cluster headaches, neck and back pain, memory and mood issues and severe hand tremors. I don't have a UK family doctor and am struggling to find medical support but I can feel my mind slipping away. I find that it is very difficult to get treatment if it isn't a new injury. Any recommendations?