My brother's scary confession

This weekend my brother made some tremendously scary confessions to me that happened about 10 - 15 years ago. During this time he had fears that lots of people were trying to kill him but these people were actual known people and not a whole group of people. He had ornate stories of this person or these people who tried to kill him while in jr. high and high school. He has nightmares, continues to taste blood in his mouth, and seems like he may have even had a flashback. When these things happen, he acts fogged, has slurred speech, and acts like he doesn't know where he is. He is drinking way too much also which could be a result of or cause of. After some tremendous thought, I just couldn't see how this very skinny boy could have survived all these fights that were 2 on 1, up to 5 on 1 where those people often had knives and guns and how even though it was a bad neighborhood that my mother didn't have some inkling that there were regular threats on his life -- none of which ever came to "fruition" for lack of a better word. I asked him how a 90 lb white boy survived against these people in a very mixed racial atmosphere supposedly wrought with drugs and gangs could have survived especially with the numerous attempts on his life. He said that when he went into fight for his life mode he could have done anything. If his stories are true, there are some tremendously scary parts of this story that I have not shared. If this is a mental illness, I need to try to find him some help. Also, it seems unusual to me that someone with this disorder could be so fixated on something from so many years ago and not anything current. Finally, he now lives what looks like a very white collar sort of life as a genial golf pro. I'm so confused. I'm the only one he reached out to and I feel so much responsibility to do something. I just want some insight as to how to understand if this is mental illness or excruciating reality. Please help.

Whatever the cause of your brothers confession, he clearly needs to see a Dr. Can you persuade him to see his GP?
Try suggesting he may have post traumatic stress disorder (Nightmares and flashbacks etc) and a GP would be able to refer him to someone who can help. Once you get him in the system, hopefully they will get to the bottom of this.
Good luck