Thanks for writing to H.C.M.
I have gone through your query regarding rumbling in your ear which got little relief on clinching your teeth or putting finger in your ear.
Your symptoms favors eustachian tube dysfunctions and is due to tubal obstruction
Here i would like to suggest you for-
(1) Tab paracetamol
(2) Steam inhalation.
(3) Anti histaminic & decongestant.
I hope this will help you