Joel, I'm sorry that your brother isn't the same person he used to be. It does sound like he has a serious problem. Unfotunately, there's not much you can do for him until he wants the help. Sometimes it can take a crisis before some people realize that they need help.
You might try printing out some of the information found under "Disorders" and have him read it or read it to him and see if he doesn't recognize himself. Along with that, also show him what can be done about the illness.
I haven't read all of the new posts so I don't know if you've found the "Caretakers" category. You might try reading some of the posts and also posting there.
Hang tough and keep posting. No doubt you'll receive a lot of useful information plus a lot of caring support.
Best of luck to you.
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.