I'm so sorry about
your brother's condition. As you and your brother now know, uncontrolled diabetes can cause kidney disease. For this reason it's absolutely necessary to continue his insulin therapy. His blood sugar levels must be controlled and as a type 1, he needs insulin injections. At this point, I don't know what procedures they will need to do for your brother. If his kidneys cannot function correctly, they will probably suggest dialysis.
When the body is experiencing pain, severe illness, trauma, etc. it's very common for the blood sugar to go haywire so that isn't surprising. An important point is how his blood sugar control is when he's not going through these episodes. Is he staying on his insulin therapy on a daily basis?
These are answers the doctors need to know.