This is a very common phenomenon among fangirls and fanboys whenever they see, hear or sense the object of their obsession.
A spazgasm is very similar to spazzing out but is caused due to fan-related stimuli.
The symptoms of a spazgasm are hyperventilation, screaming, flailing, twitching, jumping. Most of the symptoms of hysteria, actually. And is always followed by a feeling like you're about to faint.
In other words, it's completely normal and okay.
Fangirl: Absolutely, I think I had a multiple spazgasm after just the light show!
v. The act of having a spaz-gasm.
"I nearly spaz-gasmed when Jacob took off his shirt in 'New Moon.'"
"Every time I look in the mirror I want to spaz-gasm because I look so good!"