Karen, your core temp is down. Get out of your shoveling clothes; your body is spending energy to heat your cold jeans or whatever. When I get done it it's cold and windy like yesterday, start some hot water for tea, get into a warm bath, and put on lots of warm stuff. As you thaw out you can take off the layers.

BTW, we got about 15" (38 cm) or thereabouts. I need to shovel and I'm stalling!