Hypoglycemia. Is destroying my career.

I m experiencing dizziness, weakness, fatigue , exercise intolerance since last 15 months when I exercised more with reduction in calories intake ( low carb diet ) . I had stopped this program 10 months ago and have LFT,KFT,SERUM ELECTROLYTES , TOTAL PROTEIN,SERUM CORTISOL( 7.95 ug/dl)blood test all of which are in Normal ranges except blood sugar levels .   One thing more is that my weakness , fatigue increase in early morning and in late evening . Here are some levels of my blood sugar F:- 74,69,66,71,70 PP:- 84,81,78,76,74 I had my insulin levels checked which again came normal . I remember correctly that just 2 months before the starting dieting program my sugar levels are F:- 89,87,88 PP:-98,99 Plz help me as this problem is destroying my career .