Pierce made the stunning revelation on the “All The Smoke” podcast Thursday … saying he was a changed man after he nearly lost his life in Sept. 2000 at a night club in Boston. “It was so bad that I couldn’t even like, sleep,” said Pierce, who was 22 years old and just entering his third season with the Celtics at the time … “I had to have a 24-hour police surveillance in my house, that’s how paranoid I was.” He added, “It changes you, dude. You don’t know where to go, you don’t know who to look at, you on your toes. You’re like really on your toes, like, ‘Man, I’ll kill somebody.’”