"I had about four days of like, 'Pity party, woe is me, it's all over,'" he says in the clip above of his recent HuffPost Live appearance. "Then I did some research and spoke with doctors and got in contact with people who have MS, and I soon realized it's actually a lot more manageable than the kind of public perception of it is, and that's part of the reason why I've been so outspoken about it." He does some of that advocating via his website, You Don't Know Jack About MS.
Despite the episode of vision loss that originally signaled to him something was wrong and the numbness, tremors, fatigue and dizziness that are common symptoms of the disease, it hasn't all been bad news. The diagnosis has helped him realize that things happen for a reason, he says, and have helped him to keep perspective. Mostly, he says, he's learned "you can't take good health for granted."
Watch the clip above to hear more from Osbourne, and watch the full segment here.