I have severe white coat syndrome - even on meds. When I first found out I had HBP my integrative MD gave me Carditone (an herbal blend you can get online) which worked for a couple of years. Then it stopped working and I'm on meds including potassium. No problems with potassium. It's fine at home but never good at the drs. office or dentist. Even if forget to take it at home for a while I get so nervous and end up with a high reading. Then I just take a couple more and inevitably the reading go progressively lower. It really is a head trip but it's also partly genetic. I suggest a good cuff and take three readings. With my Omron you don't have to wait long. Good luck and don't forget Magnesium.