Mucus in throat all the time?

i have had mucus in my throat for the past couple years and has never really bothered me until now ive been training for the marines and now when i run or do anything to get me out of breath exspecially in the cold weather its worse it makes me have like a weezing noise when i breath i mean it dont bother me breathing i can breath just fine afterwards but it kinda irritats me> But im constantly hocking (spitting) up loogys or mucus and didnt know what it may be and would it be in my best interest to go to a ears nose and throat doctor Thanks