@nanuck test in pairs: before bed, upon awakening; pre-meal, 2 hour post meal.
A question I have regarding your fasting blood glucose is how much of a difference, if any, is there between your blood glucose from the moment you get out of bed in the morning to when you sit down to eat your breakfast?
By doing this everyday for a week, I learned there's a 30 minute gap between those two readings. If I'm quiet and moving normally, no increase, but if I'm busy, perhaps talking with my husband, blood glucose starts climbing (which can raise your blood glucose levels through lunch and dinner).
I'm impressed you've been able to get your blood glucose levels down so quickly. Well done.
If you provide a bit more information, I might have more suggestions.
What are you typically eating for meals? What is the timing of each meal? Are you doing this with medication and diet? Or diet alone? Are you taking any nutritional supplements?
There's lots of things that can affect blood glucose levels... not getting enough sleep... not feeling well due to an infection or cold... getting too much protein with each meal.... not dividing daily protein intake into similar amounts for each meal... not getting protein, fat, and carbs with every meal...
A formula I'm currently using to calculate grams of protein per day is
[ideal body weight in kilograms] x .75 gram (or 1 gram protein) = grams protein per day (that is protein grams in food, not weight of food). @Kristen251 got me paying attention to this.
Again, you're doing great! But I know it's frustrating when you had really excellent blood glucose levels and they start creeping up. Been there so many times. Sometimes I can figure out why, other times not.