Hi, I understand your concern and would explain that your actual diastolic blood pressure value is a little low. Do you have any symptoms like fatigue, dizziness, lightheadedness? If such is the case, I would recommend reducing the doses of lisinopril or hydrochlorothiazide, or even stop one of these drugs. As you have lost some pounds, it has helped achieve a new lower blood pressure equilibrium and you may need to reduce the doses of the anti-hypertensive drugs in order to avoid low blood pressure values. Regarding the difference between systolic and diastolic blood pressure values it is quite normal with aging, and it does not indicate any serious medical condition. Hope you will find this answer helpful. Let me know if I can assist you further. Kind regards, Dr. Iliri