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I'm sorry to hear your kitty sounds like he is not feeling well. Does he seem itchy? Have you seen him grooming more than normal?
Usually, losing clumps of hair and grooming excessively are signs of a flea problem. Have you seen any fleas or anything on his coat that looks like pepper? Has he had any flea treatment recently?
Ah, ok. Flea dirt or flea poop looks like pepper! He sounds like he has a flea allergy....some cats are very sensitive to flea saliva. The best thing to do for the problem is to apply a topical flea preventative made for cats. It will kill the live fleas and prevent new fleas from hatching and re-infesting your home. A couple good options are Cheristin (no prescrption required) and Revolution (prescription from your vet required). Some of the other over-the-counter flea treatments liike flea shampoo will work temporarily, but the live fleas can come back very quickly.
It can take a couple weeks for some cats to feel less itchy, even when the fleas are gone. This is similar to humans getting bitten by mosquitos...we will still itch and scratch the bites even though we are not infested with mosquitos.
Vacuuming a couple times a week and washing all of your cat's bedding will also help with the infestation.
He may have a dry mouth due to all the grooming. Is his tongue pink?
If he is really itchy, and if you feel bumps or scabs along his back, some cats need a steroid shot from the vet to feel better. The vet can also check his mouth and teeth if you are concerned there may be another issue going on.
Some cats will start vomiting and produce more hairballs as a result of severe flea infestations. This could explain his tongue hanging out.