Kitten passed away. Vomit. he was ea!

The kitten was 7 months old and was  fine but it began showing symptoms such as vomiting bile and slowing down a bit but was able to play and eat and drink then after a few days it stopped doing all of that (this happened for two days and then it passed away) he was resting and sleeping all the time tried to drink water but couldn't and kept vomiting that yellowish bile from time to time. It wasn't grooming itself and it's lower jaw stiffened a bit. But with the help of a syringe he was able to drink ors and was able to move his jaw but when pushed into his mouth it fell from the side. He was able to walk and jump as well. He had little saliva around his mouth from time to time but now always but it was mainly vomit. he was ea