The actress revived the character in 2002 after seven years away from the famous cobbles but walked away just 17 days later, describing the experience as 'like being on a conveyor belt'.
Julie made the revelation during an interview on 'Piers Morgan's Life Stories'.
She says: “I was asked to go back as a favour. So, yes, I do regret going back.
"What somebody had omitted to tell me, in the transition period, were all the changes that had happened. We’d always had rehearsal, make-up and costume and everything. I had about 27 Rovers scenes and we started at the end.
“Sorry, the end? I was used to beginning at the beginning and building up.”
She added: “I didn’t feel like I’d lost or failed.
“I thought, ‘It’s time I put my health - for the first time - first’.”
Morgan also quizzed the 71-year-old about her sexuality, asking: “You’ve had relationships with men and women.”
“A relationship can be a friendship. A soul mate, whatever," she replied. "You don’t have to have sex all the time.”
See the full interview on 'Piers Morgan's Life Stories', Friday 20 September at 9pm on ITV.