I have gone through your query.
It suggests that you may be suffering from the CSF Rhinorrhea
Without trauma there may be the possibility of the CSF Rhinorrhea.
But exclusion of the other disease and to reach the near diagnosis you may go for-
is the gold standard test in determining whether CSF is present or not.
2. High resolution computer tomography
Better to consult your ENT specialist
for medical treatment and further management.
Wish you good health