Good day to you. Thanks for the query. I am sorry for that you have been feeling down. You have nasal pressure and drainage along with severe headache. This is the sign of sinus infection also called Acute Sinusitis. If I were your treating doctor, I would recommend 1) Rest, steam inhalation to open up nasal blockage. 2) Antibiotics. Mostly amoxicillin/clavulanic acid is given 1 gram two times for 7 days. This is prescription medication. Make sure you are not allergic to penicillin or amoxicillin. 3) Take some Anti-inflammatory like Ibubrufen 3 times a day. This will help you for headache and also reduce inflammation of sinuses. You can take this over the counter. 4) Take some antihistamine like cetrizine one time at night to reduce allergy symptoms like runny nose, sneezing. 5) Drink plenty fluids, take hot/warm drinks like soups etc., as they will help you open up sinuses. I would like to review after 1 week to see the improvement. If , in case during this time you feel the worsening of symptoms despite taking treatment ,make sure you the doctor immediately. I wish you speedy recovery and I hope I am helpful to you.