Thanks for writing to H.C.M. for your query
I have gone through your query regarding buzzing noice in your one ear along with blockade. As you have been told by your GP that there is wax in your ear that appears to be correct as after instiling ear drop your ear get blocked due to increase in size of wet wax.
Other possibilities of Buzzing noice with hearing loss are-
(a) Otitis Externa
(b) Acute otitis media
(c) C.S.O.M. with labyrinthitis
(d) Miniere's disease.
(e) Tinnitus (idiopathic)
(f) Acoustic neuroma
To confirm this these investigations are necessary-
(a) Audiometery ( pure tone and impedance).
(b) C.T.scan of affected ear (HRCT).
In your case it appears to be due to impacted wax in ear, that can be remove by only ENT doctor. So please first of all go for wax removal. Unfortunately if after ear cleaning your problem doesn't solves than proceed as advice above.