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I am sorry to hear you are worried about Frankie. My name is Rebecca. I am a veterinarian and will do my best to help.
When cats are sick, they like to hide their symptoms, and will do things like hide, and not eat. If he has not eaten or drunk for a few days, he is probably dehydrated at this point.
If you check his gums, are they pink in color, or pale?
You can check him for dehydration by gently pinching skin over his shoulders, and letting go. The skin should be back in place in less than one second. If it takes longer, he is dehydrated and needs to get fluids into him.
If he is urinating less, it could be kidney failure and/or dehydration.
If he were mine, or my patient, the first thing I would do is get supplemental fluids into him by injecting under the skin or by IV catheter. I would examine him and try to find out what is wrong: infection, kidney disease, liver disease, cancer, heart disease. Any illness could make him shut down like this, but it might be reversible, depending on what is causing him to shut down.
Let me know if this is helpful and what other questions I can answer for you.
It is a good sign his gums are pink. However, if his skin is not snapping back, he is dehydrated, and needs fluids. You can try offering him broth or water or tuna juice to try to get fluids into him, but it would be better to see a veterinarian and have fluids injected under his skin.
Since he is older a thorough physical exam and some fluids would be best. Try to get him to take liquids until you can get him checked out.
How is he doing? Was my answer helpful? What other questions can I answer?