Did your GP give you any suggestions about how to lower it (apart from monitoring)? Would not have thought that raised blood pressure was all that unusual for someone diagnosed with breast cancer and having treatment. She is of course right to try and get it back to normal. My oncologist suggested that chemo was sometimes good for high blood pressure! But other things may help - exercise, relaxation techniques, deep breathing etc, reducing salt/alcohol (if applicable) may also assist. Sorry, can't help with a blood pressure monitor. Best wishes.