I have redness and itchiness in throat and nose from two months .. I had got done test where IGE was high .. I am coughing and lot of white and clear sputum comes when I am coughing from nose and throat .. I consulted allergy centre and they gave me some nasal spray and nasal wash and azithromycin for a month which I took almost but the moment I stop them after two three days my symptoms come back .. whenever I feel again itchiness in throat I use this spray and wash and feel much better .. but wondering how long can I take them also how to get checked the allergy apart from skin prick test ? Any blood test which can tell about allergy ?