Choking like Situation. I consult?

My father as usual whenever he laughs, he coughs, then automatically he becomes normal but today while same thing happened, he lost his consciousness, & it seems like he is dead. But he comes back to normal within few seconds, when we start shouting Papa! papa! Same thing like this happened 2 months before while taking his daily medicine, he swallowed the medicine with water & at sudden eyes gone up & it seems like he is dead, when we patted on his back, medicine came out and he became normal.. During this time my father consulted his heart doctor for this & the doctor said it was choking. . But today's problem is a bit different, today he is standing while we are making jokes. . Can you please explain a little bit, what kind of problem is this, & which doctor should I consult?