Hello all. First of all sorry if I'm in the wrong sub and I apologize for any formatting issues.

My brother's mental state for the past few years has been noticeably going downhill. He gets very cryptic about things and just about anything that you say to him he takes the wrong way. He also has a long history of alcohol abuse(like drink all day every day if he has the chance). About a year ago he went to a party and on his way home he got a DUI. I had to go pick him up from the trooper station that morning. He was still drunk but he seemed to be remorseful about it. Then about 2 weeks after he started claiming that people drugged him with something he calls "mind eraser". Ever since then whenever he gets too drunk he starts obsessing over it. 

The past couple of months have honestly been the worst though.  His drinking has gotten worse. Threats of suicide. He keeps claiming that people raped him in different scenarios and making all sorts of outlandish claims. Early this morning he tried to drive drunk to the store. I had to take his keys from him. Just about an hour ago he started texting in the group chat that we use for work about killing himself and other things. I took his phone and dumped all his beer and any other alcohol and took his wallet so that he can't just go and get more.

I honestly don't know what to do. I'm hoping someone out there can give me some advice to get him the help that he desperately needs.