What Is The Treatment For Stuffed Nose?

Cough, dizziness, watery eyes, and stuffed nose
I am 13, male, 135.6 pounds. My problem
is that recently ive had a bad cough along with headaches, watery eyes, dizziness, and a stuffed nose. im not on any drugs. i was recently sick about 2 weeks ago, but since then, i feel normal. but all of a sudden, i got a bad cough. it then became headaches, and now, ive been dizzy all day. all these sypmtoms are currently happening. my family has a history of diabetes and cancer. my mom has cancer and my grandad has a bunch of other diseases including diabetes. my dad has glaucoma (sorry if i spelled it wrong) which is obviously an eye disease. my health teacher says it could be a nasal infection but that wouldnt make any sense, i dont think. but thats why i came to you doctor. oh, and i get medium exercise and i play videogames (mostly shooting)