Carrots are rich in carotenes, which are substances related to vitamin A. They're found in the orange pigments and are good for you, but, if you eat lots and lots of carrots, you can develop a yellowish or orange cast to your skin. It's mostly noticeable on the soles of your feet and the palms of your hands.
Benadryl is another decongestant safe for use in cats, although it is usually not as effective as chlortrimeton in treating congestion. Benadryl is generally more beneficial with treating snake bites, reactions to vaccinations, itching, and insect bites.
Zantac will calm the stomach and inhibit vomiting. Pepcid will stop vomiting by reducing the formation of the acids that cause vomiting. Chlorpromazine is a drug that will soothe the cat and reduce the effects of a seizure, and is recommended if the vomiting is caused by poisoning or epilepsy ; These drugs can be administered to your pet, provided you consult the vet first.