First of all, get plenty of rest and drink plenty of water. If you feel unnaturally cold, do not attempt to warm yourself up, as an unnatural cold feeling is one of the first signs of a fever. Eat chicken soup and hot drinks (non-caffeinated), as well as plenty of Vitamin C.
For a sore throat, you can gargle saltwater or take a cough drop. After your sickness is cured, dispose of your old toothbrush or deep-clean it.