Snapping turtle help quick?

my youn 4-5 month old snapper is acting pretty strange. he got a worm in his mouth and them couldnt swallow it and so he spit it up. he also was swimming and only kicking one rear leg, it was pretty strange, like yesterday he wouldnt eat anything and seemed very tired and such. he also just recently ate some crickets(before this started) i dont normally give him crickets but im not sure now if it has anything to do with this strange behavior, he is also basking all the time now, eh never used to.