Hi welcome to H.C.M.Forum. some times due to anxiety
, lack of sleep, or infection B.P may raise. at that moment if 3 readings show raised B.P one should use anti hypertensives for few days,say 10 days. after stopping drug for 10 days, again if B.P is seen you should use the drug continuously. some times even abnormally cold
weather may cause rise of B.P. which comes to normal when you come out of cold weather. so continue tablets till you go to japan.thank you.