Becoming my fathers mother

My father was very young his mother died. Many years went by until his father remarried. However that was never truly his mother. Every woman has ever been with has been motherly and very 'in charge' of him. He's been looking for that Mom figure for a very long time. My mother did it for years. And he had a couple of different girlfriends in between. After his last breakup he got extremely depressed to the point of wanting to end his own life. He is 52. I'm 21. He texted me today that he needed help. So I called him and immediately because I knew he'd been having issues. He was really drunk and extremely suicidal. I was working at open to close and have no way to go help him. I look for all of the options that I could and the only person who could come and get him with my little brother. He's 16. In order to I had to call him out of school to go pick my father up and take him to the hospital. My brother left him there. He lied to the people and said he was not suicidal. They sent him out. Ended up picking him up and I laid into him. I didn't yell at him. But I told him he messed up. He's going to have to pay all this money back for no reason. I sent all of this up to make sure he got taken care of. He told me he wanted help.

As much as it's not my job to take care of him, I also can't just let him die. I told him he's going to the doctor with me tomorrow morning. The man hasn't eaten or slept in 3 days. I just don't know what to do.