Yes it could relate to your blood sugar ...
Was the 145 mg/dL fasting?
What was last hemoglobin A1C?
I think you may benefit and feel better with more to take steps to control your blood sugar ..
If more diabetic then fatigue is indeed a symptom ..
There are of course many factors which can lead to fatigue
Follow up with your doctor is advised here ...
I think to start medication such as Metformin plus more restricted diet may help you
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