Hi welcome to Health care magic forum. You are facing fainting
, and along with it tere is ear pressure, as described by you earlier.
The causes of fainting is syncope, hypertension
, sinusinitis etc.
Serc is trade name of betahistine
an anti vertigo drug, used for the relief of dizzyness
before it is treated. It has a side effect of sleepy ness in large dose , so that is the reason why you are feeling dizzy.
I advise you to consult an E.N.T.surgeon for examination of paranasl sinuses for sinusitis
and treatment. Wishing you a quick recovery and thanks for calling.