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Hello. Welcome to JustAnswer. I am Dr Z. I'm reviewing your question now, and will post back with a reply ASAP.
Thanks for trusting me to help you and Blue today. I am a licensed veterinarian with over 30 years of experience and would be happy work with you.
I do not believe that the symptoms that Blue is showing are due to the vaccine or the Droncit and I would definitely have him re-evaluated by your veterinarian. When there is a vaccine reaction, it usually only involves soreness at the site of the vaccine and resolves in a few days. Cats are so good at hiding their illness, that often by the time they let on that they don't feel well, they are often sicker than they appear. I know it seems coincidental that it occurred after the visit, but may be the stress of the visit precipitated an already underlying disease condition such as inflammatory bowel disease or even idiopathic cystitis. These could be occurring and no other abnormalities may have been noted during exam or on blood work. I would definitely advise that you follow up with your vet right away. When cats are not taking in adequate calories it can lead to other problems, such as liver disease, so I would act quickly to get this better defined and treated.
I hope this is helpful. Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please reply so I can clarify for you.
My posted replies are for general education only and not meant as a diagnosis. Only after a thorough veterinary examination can a diagnosis for your pet be made and specific treatments be advised or medications be prescribed.