Aw .
I've had Stachi jump out of the aquarium, but he didn't puff. Fell like 4' though.
Did you get all the air out? It's very important that it was all expelled... Here's a link about de-airing puffers, at least for reference...
Help! My puffer is air-filled!
It's normal for them to sit on the ground and curl tails when they are stressed. And puffing is definitely very stressing. Poor thing
How many hours will it be until you can check in on him?
If he's still alive when you get home then you should be sure to pamper him extra. Any helpful additives you have should be used, like Garlic Guard, etc. You could try to get him to eat, but if he doesn't it's not to be unexpected...
I really hope he's still there when you get back. Me and my puffers are praying for your little guy.
