Hi and welcome to the FDMB. There’s so much to say that I don’t know where to begin. You have come to the best place for a diabetic cat. We need lots of information from you in order to help you and I’m on my iPad and not able to easily help you collect it. So I am going to ask a favor of you. The folks on the main health forum have all this ready to cut and paste and help you get set up so that we can help you quickly.
A short answer to your question is no. Don’t change a thing until we get you set up and learn what has been done up until now for your cat. What’s your cat’s name? What are you feeding him? How much does he weigh? When in the cycle was that 500 bg, how many hours after injecting? Are you testing at all at home? Does he have any other health conditions? How old is he? What were his symptoms brought you to the vet? These are just a few things we need to know.
So if you don’t mind please start again here.
https://felinediabetes.com/FDMB/forums/feline-health-welcome-main-forum.28/
I’m looking forward to getting to know you and your cat. Cats have a really good chance of going into remission so let’s get started.