According to insiders, he's caught a bad cold. He tried to continue on with his filming, but had to stop because he was in so much pain. He went to the hospital and got a shot, but his situation has not improved and he is suffering from high fever, has lost his voice, and does not have strength even to walk.
He will be taking a break for now, and future schedules will be asked for cooperation while he is treated at the hospital.
Get well soon, Daniel!