If mold is the culprit, then you will have to get your house checked for the source and treated. Gastric
reflux too could be the cause. The treating
reflux with drugs and lifestyle changes with decreasing coffee, alcohol, smoking and spicy food will help.
Meanwhile try deep breathing exercise and steam inhalation. Over the counter antihistamines, and decongestants and non steroidal anti inflammatory drugs may all help. However please take with prescription.