Regarding the dose. You have held the dose long enough for is to make sure of nadirs. Tomorrow, please increase Kit Kat’s dose to 1.5.
Regarding the upset stomach. I thought that was perhaps related to Cisapride?
As I recall, Cisapride is a tablet. When I gave it to my cat, I put it into an empty, small gelatin capsule (probably a size 4, butI can’t remember right now, I would have to check my veterinary pharmacy stores and see how large it is.). If he is frequently constipated, it’s best to start with MiraLax mixed into food once or twice a day). I think I previously sent you the link to felineconstipation.org.
If KitKat is ill or has a bad tooth or teeth, that could cause insulin resistance. We do not know the cause of KitKat’s stomach problems, it seems.