Charlie Sheen took to the Today show on Monday to reveal his HIV-positive diagnosis, which he learned about about four years ago "I have a responsibility now to better myself and to help a lot of other people and hopefully with what we're doing today others will come forward and say, thanks Charlie," he told Matt Lauer. 

Sheen's physician, Dr. Robert Huizenga, said his patient is "healthy" but expressed concern that previous mental health and addiction issues could tamper with Sheen's daily medication intake:

"We're petrified about Charlie. We're so, so anxious that if he was overly depressed, if he was abusing substance, he would forget these pills and that's been an incredible worry. ... Magically, somehow in the midst of incredible personal mayhem, he's managed to continue to take these medications."

Around the same time he was diagnosed, Sheen was fired from Two and a Half Men and became a media spectacle. "There's a lot out there I'm not proud of," Sheen said of the period. "You can only hear 'winning' in the streets so many times. I've pissed off a lot of really good opportunities."

Sheen told Today he has spent more than $10 million trying to keep his HIV-positive status under wraps. "It's not great. It will be great again. I'm a survivor. I've been up, I've been down, I've been rich, I've been poor," he said. "It's another chapter in my life but it's not commerce-driven. It's socially driven. ... If there was one guy who was going to contract this who would deliver a cure, it’s me." He also shared that he is in talks for another TV show and several movies.

The discussion of whether Sheen had knowingly transmitted the virus to sexual partners also came up; he determined it to be "impossible." "While he admitted to having unprotected sex with two people since the diagnosis," Today writes, "both were informed ahead of time and have been under the care of his doctor."