I have been having dry cough for some time now. I got tested for covid and other blood test including eosinophils. Every thing is normal except esr which was 48. The cough is not regular and at times I feel k. No other problem or congestion. Cough  recovered few days back but it's back again. I tried montelucast and suppressant cough syrup on advice from doctor but it was not much of the help. Plz do advice