Except in RARE cases, high blood pressure is a danger over time - not the immediate short term. In those rare cases where it is an immediate danger, it far exceeds the readings you've stated. It goes up and it goes down. Stress and anxiety can make it go up so if you happened to catch it at a sort of high point then let your anxiety kick in, that would explain why it remained high. As would having a cold, allergies, and a whole host of other things. I suggest not taking it for a week or 2 then seeing where the number is but above all, if the docs aren't worried about it neither should you.