Another Fukien Disaster!
Not to worry. My experience with F.tea is that they are very forgiving. Mine have bounced back from what I thought was sure death a couple times.
As to the cold, I live in Ohio, where we have plenty of it to experiment with
I've found that 50F or lower will make them very unhappy, but that they can live through it. I certainly wouldn't want to take it down to 40 F or lower, although my other tropicals have no problem almost to freezing.
FWIW
pootsie