a common head cold or Sinus infection??

i'm pretty sure i have a sinus infection, i never went to the doctor but the way i've been feeling has the similarities to a sinus infection.

monday night i started to feel this dry, tingle in my throat along with mucas way back in my nose. I knew it was a postnasal drip. but as the days passed i started to get muscels aches. like as if i had the flu. then a wierd neck pain. its friday now and all i have left is decreased vision and hearing, and wierd shooting pains in random spots in my head. oh, plus a stuffy nose. are these last few symptoms normal to be considered part of a sinus infection/ head cold? or are the head pains and decreased vison and hearing something to worry about?