Welcome in H.C.M.
I have gone through your query regarding left sided headache, ear ache
and pain over nose on left side with feeling of bubbling in left ear.
Your clinical history is clearly indicating that you are having left sided sinusitis
most likely frontal, ethmoidal and maxillary sinus on left side is involved giving you persistent headache on left side and this in turn exuding mucous in nose and thus post nasal drip
starts and this ultimately reaches to left middle ear via eustachian tube and thus you feel popping in your left ear.
For confirmation and treatment point of view you are advice for-
1- C.T.Scan of paranasal sinuses
2- Culture and sensitivity of throat swab.
( Pure tone and Impedance audiometry ) .
4- Blood- CBC, ESR, blood sugar (F & PP).
I hope with the help of these investigations and there co-relation with clinical findings of examination one may reach to correct diagnosis that may be manage accordingly.