Hello this is DR ARPAN ,
Your history of persistent itchy throat, sneezing
, coughing and post nasal drip
with clear fluid and no fever suggests the diagnosis of allergic rhinitis
I will suggest you to do gargles with lukewarm salted water early in the morning before breakfast and steam inhalation on the appearence of symptoms.
Along with this i will prescribe you tab. Monte-L (montelukast-10mg + levocitrizine-5mg) one o.d.(one tab in the morning after breakfast at least for 2 weeks.