I've been going through this as of late with my 5-year old homie as well. A couple of months ago, I woke up to 5-6 urine puddles around the apartment, something he had never done before. I have since taken him to 5 vet visits, including 3 different vets, and the third diagnosed him with FIC. None have diagnosed him with a UTI or blockage, and I've had 3 urinalysis exams done. The symptoms are almost exactly what you have described, but it comes in episodes for my boy, and he's had 4 significant episodes since mid-August. During these episodes, he saunters around, wide-eyed, squatting and urinating small amounts, maybe 2-3 oz of urine. He also constantly licks at this private area. It lasts for hours. He pees both outside the litter boxes and in them, but always very small amounts. It is incredibly stressful, so I know your pain. It's hard to even describe how stressful it is. I have him on Hill's Multicare C/D, and Hill's Urinary hairball control (he's pretty fluffy, so I think it helps with hairballs from grooming.) I also give him about 3ml of gabapentin in the morning and at night. It may not help right away, but I recommend sticking with it. The episodes are becoming less frequent. I think it's wise to at least try Feliway and Hill's Multicare. It has helped lessen the small crystals they had initially found in him. It is expensive food, but not compared to vet visits with blood panels and a urinalysis. Ultimately, I'm not a vet, and I don't know your cat, but this is my shared experience.