It sounds like it’s worth looking into. There is 1.5 diabetes that unfortunately gets misdiagnosed by some doctors. You might want to check to see if you’re not type 1 or type 2, but rather type 1.5. You shouldn’t be running so high on the meds and a healthy diet. Have you ever been on insulin?
Too much insulin can be your brother’s case (it was mine). I was on a fast acting AND a long acting insulin, plus the scale (when I should administer the fast acting) was too low.
Here’s also another example of what could happen:
Your brother wakes up in the morning (normal glucose) gives himself insulin, eats breakfast. A few hours later eats lunch, but 2hrs after lunch checks his glucose and sees that he’s running high-so he gives himself a dose of insulin. That’s one way to get too much of it as well. As you know, after you eat the numbers should be higher than normal.
I’m looking forward to your discovery of what’s going on. Please seek medical advice about your highs (even while on meds) because we know that highs bring a lot of complications-and you don’t want that.