Thanks for posting your query.
The symptoms mentioned by you suggest an upper respiratory tract
involvement. The cause is probably allergic rhinitis
It seems to be a nose block and as the expectoration is clear, infection can be ruled out. Do you have any history of allergy
to dust, fur etc? You can try steam inhalation twice a day to clear the sinuses
If it doesn’t clear up you can go for over the counter antihistamines or visit your general physician who can prescribe some antiallergics.
Hope you recover soon. Please get back if you have any further queries.