Diagnosed 2 months ago. is this normal?

Hi so, Diabetes was on the horizon for me for a few years.. then winter 2020 hit, and I had a nasty back injury that sidelined me for about two months and slowed me down, and then once I felt like that was behind me, COVID hit.. and then a few months into that, my last checkup had my Blood Sugar sky high, so my diagnosis was official.

Now, since that happened, and since I started Metformin and Slow acting insulin, I've noticed a lot of very significant changes.

1. hot spot eczema on my hands has vanished.
2. Acne has gone down dramatically
3. a lower calorie diet with MyFitnessPal and a virtual banishment of all white starches and any sweets, has resulted in me losing about 30 lbs since early May
4. Most significantly, my Asthma has improved to the point where I have gone weeks without even control medication.
5. Also I used to get winded walking up this long hill to work every day, now I can do the hill no problem.

I'm just wondering what the connection between blood sugar and some of these things are. especially Asthma. I cant really find any direct correlation.