Have had my two kittens for just over 6 weeks. One of them hasn't eaten since Wednesday night. He seemed OK yesterday but overnight he's got worse. He vomited green liquid in the middle of the night and this morning is very lethargic. Won't really move and is just whimpering when we give him some love. He hasn't eaten or drank for certain since 4pm yesterday. I'm really worried and just need a handhold or some positive stories. Will phone the vet the moment they open today. I'm just worried as he isn't even registered there yet as we've had him such short time (he was vaccinated/neutered at the rescue centre). Does anyone know what could be the cause? He only started going out last weekend and hasn't been madly keen so maybe only been out 15 mins a day.