A word for an explosion of emotion [closed]

When I was reading P.S Your Cat is Dead by James Kirkwood, I remember stumbling upon a single word that meant an explosion of positive emotion, but I can't recall what that word was. The word had a heavily positive connotation. Any ideas?

Such an explosion of emotion can sometimes be referred to as an outpouring of emotion. Merriam-Webster has:

Outpouring(n): an act of expressing an emotion or feeling in a very powerful way

Wellsprings of emotion can gush, erupt, or just about any word that would describe the action of a pent-up liquid escaping/flowing from its source. (Google books & Standard/net)

euphoria (noun):

a feeling or state of intense excitement and happiness

'Even thinking about seeing it brings a feeling of euphoria so intense that I'm having to resist the urge to go and lie down.'

Source: ODO

Further information is available at: Wiki

"Effusion" is defined by Merriam-Webster as "[an] unrestrained expression of words or feelings".