He's just adjusting to a very foreign environment for him. He'll soon come to understand you represent only good things. The biting is a common thing among kittens. There is a lot of good info on the web for training cats and getting through the adjustment period. He'll soon show you lots of love, and no I don't think he fears you, he just wants to know what's going on. He'll adjust quickly, you'll see.
I think that pet relationships brought on by circumstance can be the best kind. He won't forget that you helped, maybe even saved him. Do get him to a vet soon.