Did the doc suggest trying occasional antihistamines. He can also give you a prescription
for cortisone nose spray like
flonase. You could get some allergy tests, could be allergic to something, like pet hair. Keep yourself from breathing in cold air also, could make it worse. Try vicks rub on your throat also and get those tests and talk more to the doc for more referrals for allergist and prescriptions if it doesn't get better soon. If you have pets, might be pet dander.