It is normal for it to go very high sometimes. Once before a fight, Muhammed Ali's BP was very high. See page below for some things to help BP. High BP
is not a disease. It can lead to problems if it stays high over a long time. Also you did not say how high is high. That could be 230/160 or 145/100.
Say someone tries to shoot you or you get mad enough to kill someone. Your BP will be temporarily thru the roof. That is normal. If it stays high for years, then it can damage you.