The actor-comedian, however, has now said that his behavioural issues were due to his hectic work schedule.
"I have hurt myself a lot and I think three more months will pass for me to recover completely. People ask me about my fight with Sunil and I agree it was my fault, he felt I should not be talking in abusive language to anyone, if he would have asked me why I shouted and abused I would have told him. By the way he also shouted at me," Kapil said.
Kapil said he never had a major fight with Sunil, but things were blown out of proportion. He said he still respects Sunil and would like to collaborate with him again.
"Something did happen but a lot was said. There was no fight with Sunil. I love him and I like to work with best people. I was bit irritated. Whatever has happened I still love him.
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"I wanted him to launch the trailer of our film. I told him to come for the trailer launch but he is in Canada for a show. I think if he would have been here, he would have surely come."
"When we were about to leave for Australia I saw him (Prabhakar) and I started abusing him and even he abused me. Sunil was around when this happened and he was worried for me. I have known Sunil since nine years, he is a good artiste and I have no complaints against him. If I was in Sunil's place I would have at least asked 'What is wrong with you why are you behaving weird?'"
Kapil said he was upset with the negative stories about him in the media.
"I fail to understand who are these sources who pass such (wrong) news... I used to not sleep for days as I was busy shooting for my film and the show.
"After the shooting for the film wrapped up I read thousands of news about me in two months. I am an impulsive person and I can't change that but I am clean from within."
"I was getting anxiety attacks. There were reports about me not shooting with Shah Rukh Khan, the truth is he was suppose to come on the sets at 7:00 pm and I was present there since 2:00 pm, at 8:00 pm I felt I would not be able to shoot, I can't perform on stage."
The comedian said continuous work and negative stories started taking a toll on his health and he had to seek medical assistance to come out of it. The actor added that people from the industry supported him a lot during his tough times.
"Firangi", which marks Kapil's second big screen outing after "Kis Kisko Pyaar Karoon", is set to release on November 10.