I am 31, female, 5 8, 130 lbs. Recently I ve been having dizzy spells and black outs. It turns out my blood pressure is very low ranging from high 70s over high 30s to mid 80s over 40s. I also have a resting heart rate of 100+. My last three EKGs all had borderline findings. Doctors have been unable to give me a diagnosis. Do you have any ideas?
Hello, I understand your concern and would explain that it is important for performing some blood lab tests to investigate for possible a Chat Doctor.  For this reason, I recommend checking cortisol and aldosterone plasma levels and some other blood lab tests (complete blood count for anemia, kidney and liver function tests, blood electrolytes).  The high heart rate could be related to the low blood pressure.  I would also like to review your ECG for a second opinion if you could upload them on this site.  Hope I have answered your query. Let me know if I can assist you further.  