Aw hunny! I really feel for you!

I have no experience at all, i don't even start till September!
But i'm guessing this is a totaly normal reaction to this sort of experience! I would proberly have been in floods on the floor in the room! You expected everything to be normal, and it's knocked you back! Sounds like you dealt with it the right way anyhow!And at least this way you've seen it and know what to expect next time!
Don't be so hard on yourself!