sinusitis as the history indicates the post nasal drip of sinuses cause throat irritation and falling in chest cause chest congestion and cough stuffy nose also indicate this all the other sympomps can be explained on this diagnosis need to get xray pns waters view and treat in consultation with ent soecialist till you can use anti allergics which reduce secretuions in sinuses post nasal dripping and thus decreasing soar throat and sinus pressure you can use montelucast 10 mg bd you can use antiallergic and bronchodilator syp to ease chest congestion and cough analgesic sos for pain apply neomycin h ointment in nose bd and sea water drops in nose bd to clear the stuffy nose