What Causes Dry Cough And Chest Pain?

Hello Doc.. I am 30 , male from India.. In March / April this year , I had got common cold/throat infections with runny / blocked nose , fever , throat pain etc from which I soon recovered with medicines .. But some weeks later , got following chest related issues : - Dry cough which later become mucus type - Pain/Tightess in chest upon coughing or taking deep breath - Fever (100-101°) from which I soon recovered after taking medicine for 2-3 days (antibiotic , paracetamol etc) which were prescribed by a GP. Few weeks later again , I experienced above 3 symptoms..GP prescribe same medications alongwith prescribing blood test for Typhoid(came out normal) , Thyroid(came out normal) , WBC (bit elevated at 12,500) and Total Eosinophil Count (came out normal) .. Took medicines for 2-3 days and again got well.. Now from past 1 month , I have been having following issues intermittentlly/after every few days - feeling malaise / feverish feel - lump kinda sensation behind mouth / tongue which I tried many times to spit out but just cant - very slight nausea feeling While almost daily especially in morning , I am feeling mucus/choking kinda uncomfortableness in my throat which I tried to spit out but couldnt get much.. I should clarify that : - I do not have any problem in swallowing food etc even when I experience lump kind sensation or mucus/throat choking type feeling - I do not experience shortness of breath etc - I do not have cough - I am experiencing weight gain (but probably due to physical inactivity & eating fatty/outside foods past few months as thyroid test also turned out normal) - I am otherwise healthy other than having some good acid reflux , heartburn etc issues from past few months.. What should I do of this malaise , throat mucus & lump kinda sensation ?