I imagine it is a lot to take in. I was lucky, I come from far after the war.
They really weren't all that bad, the zombies. I think the world is upside down, I don't think the train is. It would be interesting to know what is holding us all in here.
There is a Muggle infirmary, though I'm not sure they'll have magical potions. From what I understand, Harry's mother might be able to help with that.