| Have you taken him to the vet to diagnose his condition? It sounds like it could be rather serious and causing him pain! Do not EVER give him any "people" allergy pills. That could almost certainly cause serious harm, and I'm sure you don't want to make your own diagnosis, or do anything that would harm the poor liitle guy.
Please take him to your vet immediately, and have him checked out so you can find out the exact problem. Without a vet checking him and doing tests, there is no way to tell what could be the cause of his illness.
I wouldn't wait! He relies on you to keep him healthy, so he can have a long and happy life. | 
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