Veterinary questions? Ask a Vet for Answers ASAP
Welcome to Just Answer. We are an online advice service. You are through to Dr Coles. I am a UK based vet. I am sorry to hear you are having problems with your cat.
Also, please note that we experts are not employees of Just Answer, but independent here. As such, we are not aware of when you posted your question and I apologize if there has been a delay. I will get back to you as soon as I can, there can be a delay (especially with time difference) however I will respond to you. Can you tell me a little more about what is going on?
Has your cat been on any medication since his neutering? Is he eating normally or refusing food? Did he pass urine and faeces normally?
OK, does he go outdoors? Could he have gotten injured or in a fight with another cat?
it sounds like he feels nauseous.
usually lip smacking and swallowing is a sign of nausea.
I understand. If he is nauseous, there are lots of different things that could cause this including gastritis, eating something silly, pancreatitis, reaction to medications etc.
You can try to offer him something bland to eat, such as scrambled eggs/chicken/turkey.
If he is still feeling sick after that i would recommend having him seen by a vet to ensure there is not something else going on.
Usually cats are good at avoiding the heat and don't tend to get heat stress especially if he hasn't been outside.
Hopefully he feels better soon,