Welcome in H.C.M.
I have gone through your query regarding headache on back portion of head and buzzing in ears, since you are quite young and not having cold
or sinus infection
Considering your symptoms and your age group it appears as you are either having tension headache
. Please get your B.P. check.
Rare possibility is of some intracranial pathology which may be ruled out by C.T.scan of head.
Hope your query is clear