Hi Jerilyn- The HCTZ is obviously bringing down your systolic pressure beautifully. It would be ideal of course, to see your diastolic # get lower.
However, it seems like you have what they call 'isolated diastolic hypertension' where the upper # is normal and only the bottom # is high.
In many studies,isolated diastolic hypertension was associated with no significant increase in risk for stroke or heart disease/kidney disease.
In fact, the conclusions of a study I read recently were that isolated diastolic hypertension, as assessed by home BP measurements, carried a low risk of cardiovascular mortality, similar to that found in subjects with normal BP.
This seems to suggest that the prognosis of hypertension would be improved by treatment focused on systolic more than on diastolic measurements.
Still, next time you see your doctor, you should discuss this with him/her...I don't know your history or health in general, so the above info is just informational....something to discuss with your doctor.