Just a note: Kidney problems cause elevated blood pressure. For whatever reason many physicians do not request a kidney function test when a patient "presents" with elevated blood pressure. Some regularly prescribed "blood" medicines have an adverse affect on kidneys that are already ailing.The "problem" with kidney disease is that you (normally) have 2 of them and one will begin to take over the other, so eventually (if left undetected) the testing levels may not reveal a dramatic or alarming result.
Request a BUN test with your blood work, which should be done 3 to 4 times a year anyway if taking blood meds. Sometimes physicians are treating "symptoms" and not conditions.