What Does This Blood Sugar Level Indicate For Ongoing Dizziness And Fatigue?

My blood sugar is 335 and my A1c was 7.5 at my last blood draw. I have been dieting and had a sweet potato at lunch, then went outside to rake for an hour. I was feeling light headed and very weak, so I checked my blood level. Should I be worried? I also had 30 oz of water by that time. I m otherwise very healthy (5 7 207 lbs)