I read your question carefully and I understand your concern. At times only one drug is not enough and multiple drugs are needed to control blood pressure. You don t mention the other medication but you should leave it some days to judge its effect and try not to overworry as anxiety plays its role in high blood pressure as well. The visit to the cardiologist is necessary not only to check the medication but also for the possibility of tests to probe for potential causes oh high blood pressure since you are at a young age to simply label it as idiopathic (without a known cause). I hope to have been of help.