Difficulty in breathing

18y/o male c/o severe irritable dry cough continuously since 1week..no h/o of asthma,smoking,allergy.Vitals are spo2-93% a room air,bp 100/70,lungs clear,bae+ His investigation reports..kindly give me the relevant dDx, Rx and management further..

c/o dry cough on n off wich relieves on medication since 2 yrs.sputum AFB negative.dx n D/Ds

43 female.having seasonal cough dyspnea,fever lasts for 2to3 months,on bronchodilators,takes regular influenza vaccine yearly. h/o PTB in 2015,taken complete AKT. routine lab is normal,ct &serial cxrays displayed.sputum AFB negative. plz discuss management.

48 yr old male.c/o cough on &off 2 yrs wit expectoration.non diabetic.known htn on stamlo beta since 2 yrs .tlc 7500.AEC 525.cxr attached.lungs cl cl.no H/o fever.is the cough bcoz of the anti htn drug he is using??pl comment

46 years old female ℅ chronic cough < lying down during day not at night. Copious expectoration .Pus taste sputum which is thick.Sputum has no odour. Mucous comes out when stooping without cough.Little amount of mucous comes out when ridding. Occasional chest pain at the middle.occasional mild wheezing < closed room ,Change temperature < . Patient is tall ,lean and thin.Patient has no fever. Her x - ray chest pa view attached herewith. CBC within normal limits. Please suggest DX And R x .