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Giddiness is vague term - unsteadiness. If there is definite sense of rotation, it is vertigo
If it is from getting up from bed, it may be from postural hypo-tension. / It can be from anaemia – what is your haemoglobin? / Has an ECG been done?
The body's balancing mechanism is in the inner ear
. An ENT (Ear Nose Throat) specialist is the one to see - especially in the presence of tinnitus
. They have special tests to confirm or exclude the contribution of the ear - which probably is the case with you.
If there are no clues, you have to be followed up by a neurologist
In the mean time, medicines like betahistine
or flunarazine alone or in combination may help
Ask your doctor...
Wishing speedy recovery