Ozzy Osbourne has scrapped a planned European tour in order to be treated for a nervous tremor that had become "markedly worse" over the last two years. "I was at the point where it felt as if this problem was practically destroying my life along with my self-esteem," he says. "I was no longer comfortable being around people, which, as you can imagine, is not the best trait for a performer." According to Reuters, Ozzy's docs — who have ruled out Parkinson's disease — expect the tremors to come under control with medication.