It can take a couple of weeks, even as long as a month, for changes in blood pressure treatment to take effect. Diltiazem
and Altace is certainly a good combination for you and I think you should persist for another week or so and see if the BP settles. It is best not to chop and change BP treatment too quickly. You are taking just 240 mg diltiazem per day. The dose could be increased if needed but you should discuss this with yourCardiologist.