India, July 20 -- Actor Jim Parsons has revealed that the peak of The Big Bang Theory's success came with a high personal cost, saying he was "miserable" despite the sitcom becoming a global phenomenon. Speaking on the July 13 episode of All Out with Jon Dean podcast, the 53-year-old reflected on the pressure of playing Sheldon Cooper during the show's run from 2007 to 2019. "I look back now and realise that there were many ways, at some of the best moments of my life, I was miserable. I was not happy. I was stressed," Parsons said. He added that he constantly felt responsible for "keeping so many plates in the air" and believed the show's success depended on his relentless work ethic and discipline. "Maybe to a degree that was true. I don't know. I can't say because that's how I was," he added. Parsons, who won four Primetime Emmy Awards for Outstanding Lead Actor in a Comedy Series for playing Cooper, said he "wouldn't do that again for any amount of money." He added that his relationship with the iconic character has become healthier with time. "It's evolving, and it gets better all the time. What I feel is better, what I feel is healthier. It's not something that I think probably anybody, but I was certainly not equipped to, looking back," he said. HTC...