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.