Fidel Castro has suffered a serious, "embolic" stroke, according to a Venezuelan physician cited by The Miami Herald.Jose Marquina, who spoke with El Nuevo Herald and claims "firsthand sources and information" about Castro's health, described the former leader's condition as "very close to a neurovegetative state." Castro is reportedly incapacitated, and "has trouble feeding, speaking and recognizing faces," Marquina said.Rumors about the former dictator's supposedly failing health have surged in recent weeks.