You're getting that poke because the water is a conductor, and the sink is a ground. In the winter, the indoor relative humidity drops because of heating. This creates an environment in which your body can pick up a static charge, from shoes on a carpet,
or polyester clothes in a chair, or any two dissimilar, nonconductive surfaces, actually. You are probably getting a shock, maybe even an electric arc, when you touch something that's metal, because that is a ground, too.
The solution is to get a humidifier. Adding humidity to your home will make it more comfortable and ease the respiratory distress you get, as well as cutting down on the static. It also helps to take off your shoes inside, and if you wear slippers, get ones
that don't have those hard plastic soles.