It feels like a death sentence, I know... Thought I had one foot in the grave when diagnosed. Turns out it gave me a new lease on life. It helps to know what's going on, why things are going wrong, so you can actually do something about it. You don't have to be a victim to this condition.
You have a say in it.
Your eyes have been filled with sugar all this time, and your brain compensated for the distortion to your lens. Now you're getting lower bloodsugars, your eyesight'll be blurry for a bit as your brain has to quit the compensating, so you might want to get cheap reading specs for a week or two. There'll be a retinopathy test coming, and all that... You'll be thoroughly checked out. Breathe... All of this is normal, and you will be okay.
https://www.diabetes.co.uk/forum/blog-entry/the-nutritional-thingy.2330/ Have a read there, at dietdoctor.com, at diabetes.co.uk and Dr. Jason Fung's the Diabetes Code. It's a steep learning curve, but you don't have to get everything right overnight.
Just remember,
you WILL be alright.
Jo