Breathing problem. Whom do i contact?

Hello I'm suffering from breathing problem from 5 years. It is repeatedly occurring even after using course of medicines. When ever I'm exposing to cold weather I'm suffering. If suppose If I complete course of medicine today,I will not get any problem untill 2 days. After that it is the problem again. I really hate to take medicines for long time. Breathing problem includes cold, blockage of one nostril, wheezing sound, cough. My 2 nostrils do not open at the same time. If one nostril is opens,other nostril closed and vice versa. Please help... One doctor says that there is a small bone/muscle in nose through air passage. Other doctor says that it is allergy. And some other doctor says that it is asthma. Whom do I contact? please help...