Siberian Husky with pain and one dilated eye?

Today I was playing with my 6 month old Siberian Husky. It wasn't too rough or anything and he did not hit his head or injure himself from what I could see. But suddenly he sprang back and started screaming loudly like he was in pain. All the hairs on his back were standing up and he kept shifting his weight as though all his legs were in pain. This went on for a good 20-30 seconds. Finally he limped over to the corner and laid down. Any time myself or my other dog tried to get near him, he would put his ears back or cower like he was scared, so we just left him alone for a half our or so. Now he seems fine; no limping or acting like he is in pain. He's being his normal self. Only thing that worries me is that one of his eyes is dilated. I also found a little vomit on the floor that was nothing but bile, but we do have 2 cats and another dog so I'm not entirely sure if it was him or not. Could this be a concussion if only one eye is dilated? Should I be worried? (He is a VERY clumsy dog and slides around on the back porch when it is icy.)