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There are quite a lot of symptoms and it is difficult to say which is the prime affection and what are the subsequent ones. You need examination. Have you seen your GP?
Hopefully, ECG, blood pressure, blood counts and others have been done?
/ headache could be from the ear. The body's balancing mechanism is in the inner ear
. An ENT (Ear Nose Throat) specialist should see – do some tests to confirm or exclude the contribution of the ear.
If there are no clues, you have to be followed up by a neurologist
/ MRA may be needed.
Palpitations and breathlessness point to the heart. If a routine ECG / ambulatory monitoring (Holter) / Treadmill exercise ECG (TMT) / ECHOcardiogram
and so on may be needed to evealuate the heart. Giddiness could be from heart too – if there abnormal rhythm or pressure...
See your doctor and start work-up
Wishing speedy recovery