I've been trying to fight the winter bug, but i think it has now evolved into something a bit more nasty.

See below: Most winter bugs are viral, but viruses can be nasty. Sometimes people get a bacterial infection on top of it, in which case antibiotics can help, but with most "winter bugs" antibiotics do more harm than good. I suggest trying the measures I discuss in my essay here: http://tinyurl.com/zeccbso (which also applies to other viral infections) but if not improving in a couple days see a doctor.

Cold: Sounds like a viral syndrome. Would treat with symptomatic fixes. Lots of fluids and stay hydrated. Ice blocks are perfect for this. Water, milk, juice, sports drinks are all good. As for the fever it is ok to alternate pamol every 6 hours with ibuprofen every 8 hours. Decongestants and anti-histamines will help with the upper resp symptoms. Rest chicken soups are also good. See Dr if not better in a few days

Get checked: Colds can have complications such as sinusitis and bronchitis. I'd get it checked if it's getting worse or not going away just in case you need antibiotics.