There is no upregulated GR function. Cortisol levels mean nothing for determining GR function. Restoring GR sensitivity can take months on a GR antagonist, and it might not always work. The hormone levels might be high or low in different people with the same symptoms because the body tries to work around what your body's current hormonal state tends towards, and what would it take to survive through the most basic homeostasis. Low cortisol or high cortisol with GR resistance means different states with the same pathology and the same route to a cure. The body is trying to retain potassium in one, but not the other, which is an MR issue. It might be that GR is functioning normally on the HPTA feedback, but not for the nervous system. Inhibiting GRb, restoring GRa, PPRAa, restoring PXR resistance which is now allowing NF-kb to run wild and repress GR expression, ingesting safe levels of mold, overtraining, estrogens, phytoestrogens, vitamin D, there is a ton of research out there that interacts with the genes transcribing these receptors.