Sick Kittens

Today I had to take one of our kittens to the vet. Last night one of them started throwing up and today another one was, so the vet told me to bring one in to see what the problem is. I was thinking just worms or something and he could give me medicine and it would be all better. Unfortunately he suggested that it may be distemper, which is not good at all and usually fatal, and very contagious among unvaccinated cats. I'm hoping it's not that and they just got some little sickness that will get better. The vet gave me some medicine to give the sick ones and said to watch if it seems to help or not. Poor kitties.