ZQ is absolutely right ! Your kit needs a vet....and stop with the pointing a fork in his direction to see him dry heave--It's a definite , no need to experiment with seeing if it's nausea. Every time they heave their stomach convulses in spasms and becomes severely inflamed--poor thing is probably exhausted.
Let us know the diagnosis if you would.
Please get your cat to the vet. Your cat is very nauseous. He needs attention.