Blood sugar / glucose monitor?

In a roundabout way, at present I can go to the blood lab, orders from my doc. But that is not very helpful, Sometimes I get to 'feeling bad' on a weekend, etc, I don't want "a months" readings, I want to know WTF is going on. Since I KNOW I'm borderline, I'd like to find out "if that is it" or is it something else.

From about 25 until maybe? 15 ? years ago I was hypoglycemic, and I could tell in the last years that "things were changing" and then of course blood tests confirmed that.