Hi welcome to HCM.... Here according to history you can have sialdenitis -salivary gland infection along with upper respiratory tract infection.... You are given broad spectrum antibiotic to cover possible bacterial organism... Chest pain could be by bronchitis infection... Your physical examination esp auscultation done for rule out any respi pathology if present ... If needed chest x ray and spirometry done to assess cause and severity ... For imbalance problem neurological examination done and B12 level in blood checked.... If congestive symptom present antihistaminic drug can be given.... If needed from enlarged gland FNAC done to rule put its nature .... Take care Advise : consult physician or pulmonologist for examination and accordingly investigated as well as treated ...