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It is a system installed initially just in the Wing ZERO. It calculates all possibilities of a future and sends it to the pilot. Majority of those who try to pilot it suffer a mental overload and lose their mind and suffer hallucinations. The Quatre in our world had this happened and went on a rampage, destroying colonies. Heero and I went to stop him, but he didn't want to and fought Heero. To save him and stop Quatre, I got between one of Quatre's attacks on Heero and the mobile suit exploded.
Unfortunately I cannot tell you anything else because I had amnesia until my own attempt at using the ZERO system and Quatre trying to stop me restored them.
I would assume he came out of it because I wasn't told of anything else and he was back to normal when he came to find me.
It does mean though that unless his empathy tells him I am who I claim to be, he could continue to think I am a hallucination and that he has killed me. Which is not going to happen today with the restraint that blocks out abilities. It might take a few days for to settle in before he starts getting back to himself.