hello, i have a 2 month old kitten i got from a girl when he was about 5 weeks, she told me he was older..about a few days after i got him i noticed a worm crawling out of his butt so i took him to the vet right away. she gave him a oral medication. and she gave me a thing of Revulution i gave that to him a week later. He seemd to be doing fine. But a couple days ago i noticed a worm coming from his butt again so i called the vet and she said thats normal from the meds. But hes been sleeping all the time and seems to be very weak. he even looks thinner. He is eating but not so much as he used too, he not playing anymore at all. Could this be from the worms?