80 isn't really low. But I know my wife also feels lousy when her blood sugar gets that low, jittery. I think her body has gotten use to having higher blood sugar levels.
Also if you are trying to limit sugar intake you need to cut carbs too. Carbs turn into sugar in your body.
For a couple of decades my A1C was in the 6.2 range while taking metformin. I have started intermmitent fasting and a keto like diet. I also stopped taking metformin. About 3 months after that my A1C was 5.4. My last A1C test, a few weeks ago, was 5.1.