What is the best over the counter medication to treat: sore itchy throat with a voice thats gone, painful cough with yellow/green phlem and blocked nose with congestion ?

Depends: Usually warm saline gargle, local anesthetic lozenges (Cepacol etc) and at times zinc lozenges may be helpful. In the case of a viral infection, the symptoms should start to improve after a few days and subside in less than 10, If you have a bacterial infection such as sinusitis, antibiotic may be needed.

Voice rest: and humidification of air are best treatments for laryngitis. It will take up to 2 weeks for your voice to return. Avoid excessive coughing, but sometimes it is better to expectorate sputum rather than having it stay inside.

URI symptoms : Need more information but try warm drinks, cool mist humidifier and nasal saline drops but if symptoms persist over ten days or more get examination