77 year old, male. Low energy level, but can drive myself to do physical work. Have a history of heart problem. 7 years ago, had 2 bypasses and aortic valve replacement. I take 2 blood pressure prescriptions. Now, experience some loss of balance, some dizziness late in the day and what appears to be low blood sugar. I have been told I have hypoglycemia. I just feel weak and sleepy.