When is the worst time to get sick?

Right before the holidays I come down with what I thought was a sinus infection but now I'm not so sure. I'm leaning more towards the ever popular common cold. I'm trying everything to kick this before Thanksgiving but it's not leaving easily. I bought a humidifier (which helps somewhat), and about 25 dollars worth of cold medicine. Has anyone ever taken Zicam? That's what I bought and am trying right now...along with Coldeze and saline nasal spray for my dry nose that wants to keep bleeding. Sounds lovely doesn't it!?