I try to take Cold FX (boosts your immune system) when I start to feel sick, they don't work as well when you are already fully sick. My routine when I am sick is usually take some dayquil/nyquil depending if I want to sleep. Then I lay on the couch and watch shows while I use up all the tissue boxes in the house. I also use lozenges when my throat gets sore.

Getting sick isn't fun, hope you feel better soon.