Very low blood pressure?

My BP is anywhere from 89/55 - 118/70 which I feel fine when its around 118/70 but when it gets low I feel dizzy a lot of the time I'm afraid of passing out which I have in the past I've gone to the doctor however my BP raises a little every time im there so "im fine" im a 23 year old female I... show more My BP is anywhere from 89/55 - 118/70 which I feel fine when its around 118/70 but when it gets low I feel dizzy a lot of the time I'm afraid of passing out which I have in the past I've gone to the doctor however my BP raises a little every time im there so "im fine" im a 23 year old female I exercise everyday and stay hydrated I eat okay im looking for answers on how to raise my BP and keep it a little higher, has anyone experienced this themselves? Thanks!!
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