HBP: spoiler Snape

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Hi
On rereading the final Snape/Harry confrontation I noticed that 
after Harry first calls Snape a coward Snape remains sneering, not 
out of control at all. It is only after Harry tries to use the 
curses he found in Snape's potion book that Snape goes ballistic "he 
was no longer sneering or jeering: the blazing flames showed a face 
full of rage." Snape then goes on to say "you dare use my own spells 
against me, Potter? It was I who invented them I, the Half-Blood 
Prince? And you'd turn my inventions on me, like your filthy father, 
would you?"

This must relate to OOP Snape's Worst Memory, surely? In that scene 
the first spell Snape uses is Sectumsempra and then James uses 
Levicorpus, how the hell did James get that spell? 

Why is it the use of these spells sends Snape over the edge do you 
think?

Regards
Jo