Sir Paul McCartney's estranged wife Heather Mills has spoken of the intense pain she feels over her split from the ex-beatle. Mills, a former model and animal rights activist, split with MCCartney in May (06), after four years of marriage. She says, "I have never felt more alone in my life. It's like I've been abandoned. I can't pretend it doesn't hurt. It's like a physical pain. It just goes on and on."