like yours -- and the year before, I had totally normal fasting morning blood sugars. So, don't worry about that.
It seems that the doctor put you on insulin, am I right? I wonder why -- my doc, back then, put me on Metformin, 500 mg, twice a day, and had me check my BG 2-3 times a day to see what foods spiked me the most.
My insurance company paid for a week of diabetes/nutritional counseling. The info about diabetes was quite useful, but I considered the nutritional advice pretty useless. (I've always been very knowledgeable about nutrition, so I wasn't starting from zero.) If you eat as many carbs as they suggest, you'll never get your blood sugar under control. However, going low-carb is quite a change from 'regular' eating. I've found that I cannot eat rice, regular bread, potatoes, grapes, or sweets regularly or my BG spikes. After 4 years, my doc gave me a pill (Repaglinide) to use occasionally when I anticipated a carby meal (birthday party, travel/vacation, etc.) and that works well for me. I can have the bad stuff once in a while so I don't always feel angry about having to eat low carb all the time.
On this regimen, my last A1C was 5.4. All my bloodwork (liver, cholesterol, kidney, etc.) came back as totally normal. My doc has been very happy with what I am doing with diet and exercise and says he wishes all his patients were like me. The major change that I've made lately is that I have become largely vegetarian (I use dairy and eggbeaters).
The exhaustion is probably caused by the abrupt lowering of your regular daily BG by half -- your body was used to running on high BG. It shouldn't last long.
One thing I am trying now is to have the same breakfast and same lunch nearly every day, so I just don't have to think about it. I am trying to find recipes that incorporate the stuff I need to eat, but in a way that 1) I get all the nutrition I need, 2) it's easy to make up ahead of time, and 3) doesn't boost BG.
As your BG comes down and you start eating low carb (if you do), you can ask your doc to try getting off insulin and using Metformin. It's soooo much easier!