This is precicely the next blood test that i've already requested. It's been on my mind often. Renin, Iron, Aldosterone, Ferrin are all my next focus and balancing those out. I believe i have low aldosterone. Upon standing my blood systolic blood pressure increases only about 5 point from say 108 to 113. But the main thing i see occuring is having a pulse of up to 105 or 90. Sitting down my pulse is on avg 70. After standing in place for about 2 minutes i get mad lightheadedness and difficulty breathing. I believe this is low aldosterone, which mimics many of the symptoms of low cortisol. This also explains why after 3pm everyday i cannot walk too far at all without getting a high pulse and difficulty breathing.
Now on the hunt: how to fix low aldosterone other than just salt intake.