Glaucoma isn't necessarily linked with Diabetes, although it can be.
My late mother had glaucoma, which is why I have had free eye tests for decades but so far no glaucoma.
She didn't go blind, either.
I think you need to take a deep breath and push the glaucoma into the background for the moment and address your BG control.
You sound to be in a panic so try and separate out your different issues.
Your retinopathy is likely to be linked to your BG control.
This is the first thing to address.
Your levels are far too high, so your insulin regime isn't working.
You shouldn't have to fast if you are taking insulin as that should bring your BG down if you are taking enough of the right sort at the right time.
You should go back to your health care team and explain that your insulin regime isn't working, and ask for help to fix this.
I am not an insulin user, so hopefully T1s/T2s on insulin can come in and offer advice.
@Antje77 can you help? I suspect insulin users are ignoring this thread because the title is Galucoma, but it seems to be about poor BG control by an insulin user.