First things first.
Go out to the drugstore right now, and get some ketone test strips, to test your cat's urine. Let's have you and us make sure there are no ketones present before we start suggesting a dose.
Second things second.
Signature information needs to be set up ASAP, please. Pretty please with sugar on top. Helping too many people right now, to go back and read through this entire thread to see what is happening.
Third things third.
Get our standard format SS set up, and put any test data you have in there. Instructions were probably posted in a previous reply by someone.
Fourth things fourth.
If you aren't home testing yet, get started. You'll likely save your cats life.
Plus, very few people here will be willing to make suggestions on the dose, if there is no SS and test data to look at.
That is like asking us to drive down the Autobahn, at 120 mph, backwards, with our eyes closed, with thousands of other cars on the road to avoid hitting. In other words, impossible.