Thanks for writing to H.C.M. for your query.
I have gone through your queryregarding watery discharge from nose, with pressure behind the eyes and throbing pain in fore head between eye brows. It is more marked during flying. The fluid comming out is a matter of worry for you as about it's nature i.e. is it allergic fluid or cerebrospinal fluid
Here I would like to tell you that allergic fluid and cerebrospinal fluid may be differentiated clinically and by C.T.scan of paranasal sinuses
Clinically in allergy
watery discharge is from both nose (never unilateral), associated with bouts of sneezing
. On the other hand in CSF Rhinorrhea
discharge is USUALLY UNILATERAL and has comparitively less sneezing.
Finally this condition may be confirmed by C.T.scan of paranasal sinuses and by BIOCHEMICAL & CYTOLOGICAL examination of fluid.
So a thorough ENT examination and relevent investigations as discussed above will help in making correct diagnosis that may be accordingly manage.