It is not clear exactly what you are suffering from. A runny nose is typically one of the symptoms of a common cold. In many cases, a cough is also a common cold symptom. However, the common cold is a viral infection, and there is no known cure for it. Any treatment for a common cold is symptomatic, and often unnecessary and ineffective. It is therefore not clear why you are on antifungal medication or on what you call an antifungal diet. In addition, a cold never lasts for more than a week - so the four months of treatment you mention seem to have no relation to your runny nose and cough. The symptoms you have mentioned could also be part of an allergic reaction, but here too there is no need for any antifungal medication or diet. Even if you are suffering from sinusitis, the diet seems unnecessary. An antifungal diet is meant to get rid of fungal infections of the digestive system, and it is extremely doubtful that there is a connection between such infections and symptoms such as a runny nose and cough.
You seem to have left out some information relating to your diagnosis, or else you are mixing up two different sets of symptoms and treatments. Whatever the case may be, it is advisable that you either return to your doctor or get a second opinion from another doctor whom you trust. If symptoms such as a runny nose and cough have persisted for four months, or even for one month, there is something seriously wrong and you should not be relying solely on home remedies and over the counter medications. If you need to take antibiotics or other strong medicines, this is something that you will simply need to accept. If used responsibly, both by the doctor and the patient, antibiotics are highly effective and have only mild side effects, if any.
In the meanwhile, you can practice steam inhalation for your runny nose. This should be done at least thrice a day, and more often if you can manage it. For the cough, a warm salt water gargle is the best home remedy. You can also crush a piece of ginger, mix the juice with a teaspoon of honey, and have this remedy twice a day. However, remember that these remedies are unlikely to get rid of a four month old cough and cold.
answered by G M