i was 90/5x too, even doctor/nurse ask me, your blood pressure is very low, and check with me whether i was like that, yes, i was that low for years.
feel dizzing, do u wake up or any action like brow down then stand up too fast? nervous?
only one or two times high cannot be count as anything, and 11X is not high anyway, don't worry, if u little thing be worry like that, u may really got sickness one day.
i was 90/5x, perhaps due to i was the athlete when i was young represent our school for years, keep such low blood pressure is good, and my heart beat rate is good 7x (under 80).
but i think too low, the low blood pressure, it made feel dizz sometimes.