Desar John and mandi,
It sounds like your cat has a severe intestinal upset. It could be caused by a bad bag of food, mold forming in the bag, swallowing a non food item, a bockage of hair or other item in the intestine.
If he wants to eat, he is not feeling that bad. however, do not let him eat food from that bag. Either open a new one or give him canned cat food or boiled chicken.
If he cannot keep anything down and his tail remains in that position - you must get him to an ER vet for evaluation and treatment.
Please let me know what is going on with him and if you have any more questions, I will be happy to help in any way possible.
Very sincerely,
Terri
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Dedicated to Cats and the people who love them!
Please press ACCEPT if my answer was helpful and leave feedback Thank you! Terri