Thanks for writing to H.C.M. for your query.
I have gone through your clinical history regarding feeling of heavy sensation behind the ears and your C.T.scan and blood investigations denies the sinus infection
than it favours for Eustachian tube dysfunction
There is a tubular connection between ear and throat, this is ment for ventillation of middle ear, and it opens during-
(c) Blowing nose against close nostrils.
Mostly this tube gets temporarily blocked in inflammation of throat, but if throat is O.K. this indicates that it is either stenosed or blocked due to chronic throat infections.
For treatment you should take antibiotic, anti inflammatory, decongestant and steam inhalation. If by this treatment you get relief than job is finished .But on the other hand if this conservative treatment fails than myringotomy
with grommet insertion will be line of treatment.
Hope this will help you.