Vertigo, dizziness and headache are known side effects of lisinopril. But you are a diabetic patient therefore other causes of vertigo, headache and dizziness such as high blood pressure and ear or eye problem need to be ruled out. But more chance is that it is due to lisinopril. For ruling pot other causes you need to consult a neurologist who will properly examine your nervous system and will recommend investigation as per need and as per finding on physical examination. Advice 1. Continue lisinopril and other anti – diabetic drugs as suggested by your doctor 2. Consult a neurologist of your local area 3. You can take cinnarizine for symptomatic relief of vertigo and dizzines 4. Avoid smoking, alcohol, coffee and caffeinated beverages 5. Regular exercise at least 30 minutes for 5 days in a week. The best types of exercise for lowering BP include walking, jogging, cycling, swimming or dancing. 6. Eating a diet that is rich in whole grains, fruits, vegetables and low-fat dairy products 7. Consume less salt 8. Lose extra weight if you are overweight and keep your body mass index between 19 and 25. BMI is calculated by formula BMI = Weight in Kilograms / (height in meters x height in meters) 9. Reduce your metal stress because stress activates sympathetic system and increases BP 10. Measure your BP regularly and be in touch with your regular doctor 11. Regularly check your blood sugar level I hope this information will help you. I will be happy if you ask another question Thank