Hi Kaye-
He actually could have a neurological defect that is causing him to feel pain in his tail. If he seems to be in as much pain as you indicate, you definitely should take him in and let the vet see if they can make a determination as to what the problem is. This is definitely not normal behavior for your cat and is somewhat worrisome! Please let me know if I can help further and what your vet says.
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Lori McLaughlin
Your veterinarian should ALWAYS be consulted first and foremost when your pet's welfare is at stake.