Suffering from dust allergy from past 3 weeks

Patient: I’ve dust allergy. Whenever I get cough I feel very difficult to breath, due to cough I even vomit. Already I’ve consulted Ayurvedic doctor and got treatment but still facing same problem. Today itself I completed one week medicine course. I would like to know how to cure dust allergy, what kind of foods should I consume? Please help me out. Thank you

Symptoms: Coughing, sneezing, vomiting and breathing problem