Ige levels. To lower down ige levels?

Sir I had chest infection in August 2019 and I was prescribed to have antibiotic augmenten for 5 days but i still had cough then doctor gave me monocef with dexona injections for 5 days and after that I ws fine my cough went away . But after that every now and then I had cough when I used to wake up early morning or sometimes without any reason then doctor prescribed me to have CBC and ige levels my CBc was all fine I just had lymphocytes raised to 43% and my ige levels were raised upto 88 kuA/l but still after that doctor advised me to take montulucast and levostrezine for sometime because he said my xray and pft were fine and it was due to allergy.. but after the medication was over I still have the same thing I get cough without no reason i dont even touch chilled or freeze foods I take warm water everything warm .. but sometimes I have cough and it goes away by itself .. can you please suggest me what to do to eradicate this cough and how to lower down ige levels ? Please help.