Diabetic Ketoacidosis (DKA)

Your pancreas doesn't produce insulin, it probaly doesn't produce glucagon either?
"But people with longstanding type 1 diabetes often stop producing much glucagon and need glucagon shots to bring up a serious low." —Diabetes Daily

I have only had slight interest in DKA since it is mentioned as a danger of doing the keto diet wrong!

The keto diet is an intentional switch to very few carbs per day (like 20g!) to make your body depend on burning fat when carbs are not available. Blood sugar is stored as glycogen in the liver and fat cells. It is a back-up system for times when carbs are not available. Think evolution and early man foraging, then stretches of no success gathering the "right" fruits and vegetables and living on mastodon burgers. Voila, the Paleo diet was born. It lives on today as the Ketogenic diet. The keto diet burns fat that then produces ketones for fuel; the dieter loses weight in a short amount of time. That's the plan. Clearly some people manage to do just that. The potential problem is that ketones then convert to acids, including acetone! That can become ketoacidosis.

But I start to see what happens! Your past meds included Victoza and Bydureon, both designed to make the pancreas secrete glucagon, which then makes the liver release glucose. But your liver is probably not able to produce the glucagon, so no bumping blood glucose. Meanwhile you were burning ketones like crazy, so ketoacidosis should result. A wicked combo: hypoglycemia and DKA both waiting to happen. Your doctor at the time should have put you on glucagon injections to pair with the insulin.

So the doctor would wonder how you had missed out? I guess that sounds reasonable. Your diet was limited, insulin was lowering what little glucose would have been produced from very limited carbs, the the fat being used was adding acids and no glucose-push from missing glycogen. Somebody screwed up by not issuing another med.

As always, this is all just speculation, not medical advice. That's why the idea here is to keep track of questions for a real doctor. Good luck with that, huh?