Whoa Shake. Do you dress warm? I know that NY is hella cold this time of year.
You have to dress warm and take care of yourself dude. Yeah dressing warm is a major bitch, but in the winter it's a must. Even if you just wear a bean hat and leather jacket (like me), that will help.
FLUIDS FLUIDS FLUIDS. Know your fluids. Orange juice is tasty, and it can be had with every meal. Same with water.