With my experience, usully the police get involved, sort of a "rock bottom" kind of thing. That is the way my brother got diagnosed. My mother was the one who called for help, because he had tried to kill himself earlier that day (unbenounced to me, of course) When he found out my mom called the cops, it was like a 360 change of personality!! He immediately lost it, snapped! He tried to stab my older brother first when he stepped in. Luckily, my older brother removed the knife from his hands, but unfortunately, not before he got stabbed.(like on the side of his stomach) My Dad was protecting me and my Mom. My brother went straigt thru my Dad (who was also military police, and a big guy) and chased my Mom outside the house, who, by this time swept me up in her arms with a blanket and my teddy, and took me to our neighbors house. My mother was crying hysterically, and reassuring me that everything was ok with my brother, but of course, I knew that wasn't the case. At the neighbors, my mom placed me on their couch by the front window I was able to sit up on their couch and look out, and saw this crazy surreal scene, sort of like it was in the movies or something. Or a bad dream I was having. My brother had some kind of "super strenght". 4 cops and 2 paramedics where trying to hold my brother down, and he refused to leave without a fight,and these where military cops~Those are some big dudes! My brother tossed them around like a child would toss around stuffed animals. One after another, they got tossed off from him, and they kept going back for more. They finally pinned him down, 2 cops with their knees on his back and 1 paramedic administering a sedative shot. My brother's face was pinned to the ground, (you could see the dust he was blowing off the ground from being so winded and wound up) and he screamed like a caged animal untill the drug began to take effect. When they started to move him to the ambulance,the neighbor's son (who just so happened to be my brother's best friend at the time) pulled me away from the window, and said " Dont worry, Your brother is going through tough times, he'll be okay". About a week later, he got sent off to Arizona to a special facility that specializes in bipolar and drug addiction.
One of the most frightening, but fascinating situations I ever experienced, I will never forget it.