I have only been on 20mg Lisinopril for 2 weeks. PB is bouncing between 196/63 and 188/77. How long will it take to drop 20 points or more? Age is 67 with moderate activity. Have tummy fat but not overweight for age and height. I have had migraines since adolescense and wondering how Lisinopril will effect both prevention and lessening of symptoms.