I have been frequently getting cold form last one year. I can say in every 25 to 30 days

. Everytime I get a cold, I feel the itchy & irritation on my left nose which is very strange. Not sure if this is due to allergy or something. On the 2nd day of cold, I generally have a running nose. If make my head down, water drops comes from my nose. This becomes very very painful for me

.
I haven't consulted a doctor yet. If I need to consult a doctor who should I consult, is it a ENT or Allergy speacialist? Please help me.
Also if you know anything on this piculiar left nose thing, please suggst me.
thanks,
BSR