I worked in a sawmill for 6 years. i started having trouble with coughing, stuffy nose, and hard wax build up in my ears. how can i cure this?

Difficult: Worse that you report is cough. Cannot imaging that air is less than replete with wood dust. Breathing that daily cannot be good. I expect that no filter masks worn or advised. It would be interesting to study work injury literature about this matter and long term effects. I am betting that there are significant long-term effects from this chronic exposure. Pharmacies sell otc wax softeners.