<s>[INST] 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. [/INST] Hi, dear. I have gone through your question. I can understand your concern. You have hypoglycemia.  It's common to have dizziness, fainting, loss of balance in hypoglycemia.  You should take sugar urgently whenever you feel these symptoms.  If severe then you need hospitalization.  Consult your doctor and take treatment accordingly. Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using Chat Doctor. Wish you a very good health. Don't forget to click, thank you. </s>