Wow, those numbers look like textbook primary adrenal insufficiency (aka Addisons disease). The worsening of symptoms after exercise fit, too.
I take it that the adrenal issue is self-diagnosed? I can understand your reluctance to entrust another doctor with this, but you will bring him a very strong case so he will have no choice but to do formal testing for Addison's. I.e. specific blood work, an ACTH stimulation test, abdominal imaging, and subsequently maybe a test for the presence of VLCFA, maybe genetic testing.
It's important to get a precise diagnosis since that will determine the best treatment plan. For example, if there's an autoimmune problem and you have adrenal cortex autoantibodies, then taking that Thorne supplement may make things worse by flooding the body with antigens. In general, I don't think the bovine adrenal cortex extract is sufficient in all but the lightest cases. In those who are not deficient in any micronutrients like yourself, I don't really see how it would help. In any case, the blood tests will tell you the extent of the deficiency and will inform you and the doc whether you'll need hydrocortisone and possibly fludrocortisone medication, and if so, at what dose, and with what dosing pattern. Even if you don't need them regularly, having some on hand in case of a particularly severe adrenal crisis is a good precaution to take.