[Aegis]

I've accidently scared my hamster before too, and after a while they'll be okay. Just make sure that the room his cage is in is quiet and calm, and eventually he'll chill out. Also continue to give him attention after he stops freaking out so he will re-bond with you, but little mistakes with hamsters aren't really that bad. He will definately go back to his normal self after a while. I hope all goes well!
-Aegis