If you have had the sinus infection for more than a week you should see a doctor. If not, they make something called sinus rinse, you will need a bottle or a neti pot and the packets of solution. You mix the contents of the packet with distilled water and rinse your sinuses out (yes put the water up your nose) it is uncomfortable but it really does help.
For a sore throat you can gargle with Salt water. Mix a teaspoon of salt into a cup of warm water and take it into your mouth, do not swallow it! Hold your head back and gargle so it bubbles in the back of your throat.
i also had a sore throat too. All I did was not talking so much. Also don't scream because that will make it worse. Also gargle warm salt water. Don't forget to rest! If that doesn't work, then go to the doctors. They will give you a special medicine. HOPE YOU FEEL BETTER!