I'm sorry you are having problems with your Kitten! It is scary when things happen to your pets because they can't speak and tell you what is wrong.
I know it can be expensive, but I would recommend taking your kitten to the vet. It is probably nothing, but it is better to be safe than sorry. I have a dog who is constantly having problems. I usually end up taking him to the vet like once every two months!
Good luck. I hope your kitten gets better.