IT IS REVERSIBLE. Be scared, diabetes really ruins every organ you have. So, be scared and be super vigilant. Ketogenic diet absolutely works.
Lots of us get diagnosed following a very stressful period, because not only stress causes inflammation but we tend to slack on self care during those periods and use carbs like a crutch.
And have hope: I was diagnosed, A1C slightly over 7, got terrified, got advice about keto and started the same day. Followed keto subs, educated myself. In 6 weeks, A1C dropped to 6. Morning sugars took more than a year to come down. I used no meds, just keto. Not even exercise, though it would help. Now, 2 years later, I'm not even prediabetic. A1C 5.3 I no longer do keto, but intermittent fasting and low carb because it's easier. If my blood sugars get out of control, I will remove all fruits and other carbs again.
If you decide to do it, here's a couple of tips: Buy magnesium glycinate, start using right away. Remove all carbs and processed foods from your pantry. Read labels, most innocent looking foods have additives, for example I used to buy organic grilled chicken strips, or whole BBQ chicken, they have bunch of carbs and preservatives. Now I only buy real, whole foods, nothing prepared.
Good luck, it's hard but diabetes complications are harder. You got this!