A. There are 3 very common signs that a cat is very sick: hiding, not grooming and not eating. Additionally, trouble breathing- I.e. Belly is going in and out, rate of breathing is fast, mouth open while breathing- are signs that your cat needs to be seen by a veterinarian as soon as possible. This is indicative of a possible heart, lung, or even blood issue. Based on your information, I believe that your cat has something serious going on and you should take your cat to your vet or an emergency hospital now for an exam, X-rays and bloodworm at a minimum. Keep you cat as stress free as possible on the car ride. Good luck.
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