Could someone explain the details of the "Charlie Sheen fiasco"?(Please read details)?

Charlie Sheen was a small part of my life, starring for so long in one of my favorite sitcoms. A sitcom I'd watch nearly everyday with DVDs. And honestly I did not know that he was so much like his character, actually it's as if they based his character on him. When I skim through Y!News I always seem to find him somewhere, and it's like everyday he keeps making such big scenes and calling his former bosses idiots and what they did "juvenile" and I'm starting to wonder if anyone's actually siding with him. Could someone explain to me what's happening? Is he just seriously high on drugs that he thinks he's right or am I just not well informed on the story with him?