8 Days A Week, Cough

I start my first shift in a run of eight today. Working eight days in a row is a pain in the arse but at least I get 4 days off at the end of it. My plight isn't helped by the fact that my shift starts at a different time for the first 5 days of this run. It leaves your body not knowing if it should be going to bed or not.
the other thing that isn't helping is that I can't seem to shake this cold off, it's already been 10 days. I'm still coughing at night and my nose seems to have turned into a tap which is permanently turned on.