Take an analgesic such as paracetemol, but don't exceed the recommended dose if you care about your liver (and make sure you take into account the fact that some cold & 'flu preparations contain paracetemol). Eat plenty of fresh fruit and vegetables. You could also try gargling with warm salt water. If you live with others, make sure you cough or sneeze into a tissue or handkerchief. Also, remind them not to pick their nose with bare hands.