your history suggests vasovagal syncope.vasovagal syncope is a common cause of recurrent syncope
clinically these episodes present as an isolated event with an identifiable trigger or a series of recurrent episodes.
symptoms can be explained by variable degree of activation or depression
of the autonomic nervous system.symptoms before fainting
are caused by decreased perfusion of brain.
vasovagal syncope is a very common condition and studies show that 20 % of general population suffers at least one episode.most common between 10-30 years of age.
My advice to you is to be relaxed your episodes seem to be benign episodes there is nothing to worry.please undergo the advised tests as they are essential to rule out other rare causes.hope this helps.take care!