How to treat a blocked sinus?

Hi, so since saturday afternoon i have had a sore throat, then on sunday i had a flu sleepy warn out feeling, from monday to tuesday I had a runny nose, today is wednesday I have a blocked nose my left nostril was blocked first then transfer ed onto my right nostril my ears are blocked but mainly my right ear is blocked today i have started to have to clear my throat because I feel Flemish. I have a party at the weekend and I want to feel better, How to I unblock my sinuses and feel a lot better? Ive been feeling so lazy especially after a hard day at school I have tons of coursework and it drags me down... Please help?