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.
I can tell you from experience. High BS is bad for you but doesn’t really make you feel bad. On the other hand low BS is dangerous and will make you feel really bad. Shakes, sweat, delirious, confused.