The state Medical Examining Board on Tuesday fined a Norwich doctor $5,000 for mishandling the care of his diabetes patients and fined a Bridgeport doctor $5,000 for improperly documenting prescriptions. The board also fined Dr. Thomas Cocco of Bridgeport $3,000 for inappropriately prescribing drugs to himself, his son and his wife. It also barred him from performing surgery because his fine motor skills are impaired, state Department of Public Health records show. Also in a highly publicized case, the board dropped sexual assault charges against Dr. Tory Westbrook because the Glastonbury doctor, who has been convicted of sexually assaulting patients, had voluntarily surrendered his medical license May 9 as part of a plea agreement. In levying a $5,000 fine, the medical board found that Dr. Hervey Weitzman of Bridgeport had failed to properly document prescriptions for his daughter and another person between 2010 and 2011.