The pic of Lulu is a few years old. She has been on a diet for quite some time now, losing slowly, but when I noticed that she started rapidly losing weight, drinking lots and peeing a LOT, I took her to the vet, where they did a complete blood panel. That's when they discovered diabetes, mild electrolyte imbalance, and pancreatitis. Vet rx weekly shots of B12 for the pancreatitis, Lantus for diabetes, and advised that the electrolyte imbalance was a result of the high rate of urination.
Otis may be related to your Punkin, they sound so alike. He lays on my chest at night, drooling and staring into my eyes as I give him scritches and rubs, and tell him what a beautiful boy he is. Follows me everywhere. I, too, have never had a kitty like him, I adore him. When I adopted him from the Humane Society, they had performed orthopedic surgery on both his knees, had repaired some really bad wounds, and there were seven pages of medical records on him. I guess they could see what a special boy he is and was worth saving, I'm sure his vet bills were well into the thousands. When I saw him with the collar around his neck, I knew he was mine and I was his.