HI,
How are you? Nosebleeds and headache may indicate blood pressure problems or anemia among other things. While brief unconsciousness is often caused by dehydration, low blood sugar,or temporary low blood pressure, hyperventilation or serious heart or nervous system problems. I would recommend that you have this evaluated further by your doctor for proper management. The underlying cause may be determined with some laboratory tests such as complete blood count and if possible, CT scan of your head.
Take care and keep us posted.
Oooooops! Blackouts should not happen to anybody, period. When you put the nosebleeds with that, you have no choice but to go see your family doc, to get a referral to a neurologist. I do not know what this might be, sorry I cannot advise you. But I do know enough that you gotta get in to see a doc straightaway. In no way is this normal, I don't care what anybody else might say.