@artcasper This happened to my Jon a few times. The good news is that he was totally fine the rest of the time, a completely happy normal boy.
My vet reckoned it's a neurological issue because of the eye twitching. It could be something like a blood clot or a bit of air in their veins somewhere. They are so small anything tiny would cause an issue.
It is scary to watch isn't it! When it happened to Jon I would hold him so he felt secure and then put him back in the cage afterwards.
He would be a bit off for the rest of the day but then be totally fine. The vet and I said it was probably very tiring for him, hence why he just wanted to chill out and relax afterwards.