My suggestion? Intermittent fasting to reverse it.
When I was diagnosed with II I purchased a meter and then went about testing myself. There was absolutely no rhyme or reason to the fluctuations — whether I fasted, sucked up ice cream or gorged on pasta. I threw the damned thing away and decided that a sensible diet free for the most part of sugar would do the trick. Eighteen years later I’m still around, as is Metformin.