<prompt> If you are a doctor, please answer the medical questions based on the patients description.I am experiencing nausea, vertigo and am thirsty. This has been going on for about 5-10 minutes. Its happened once or twice before, but not lasted this long. I am 64, HIV, my CD4s were 450 three months ago had been 600 before that, and my viral load has been undetectable for years. Stroke runs in my family and I have borderline sugar issues.  <response>: Hello! Welcome and thank you for asking on Chat Doctor! I understand your concern and would explain that your symptoms may be related to low blood pressure and borderline blood sugar. Have you measured your blood pressure during these days? I recommend consulting with your GP for a careful physical examination and some blood lab tests: -blood fasting glucose-glucose tolerance test-HbA1C-blood osmolarity. Urine osmolarity may be needed. Meanwhile, I recommend modifying your diet a diabetic diet, avoid sugar intake and take plenty of fluids. Hope to have been helpful! Best wishes! 