What does this idiom mean: to go to pieces?

[Werdna]

Test No. incompl/inter-58 "Lots of Pieces", question 4

Charlie came home when the burglar was still there but he didn't ......... to pieces, he stayed calm.

(a) find
(b) come
(c) go
(d) try

Test No. incompl/inter-58 "Lots of Pieces", answer 4

Charlie came home when the burglar was still there but he didn't go to pieces, he stayed calm.

Correct answer: (c) go

Your answer was: incorrect
Charlie came home when the burglar was still there but he didn't try to pieces, he stayed calm.
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What does it mean, "go to pieces"? To harry up?

Thanks a lot.

[Alan]

This means: panic - lose control - get in a very nervous state.
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