I wouldnt really know the symptoms of adrenal exhaustion. Ive had an ongoing visual problem for years extreme floaters, flashes of light, ghosting of vision, etc.... That has been slowly worsening for a long time. Im usually nearly constantly somewhat anxious as a result, but sometimes the anxiety flares up and gets much worse. I guess this could drain my adrenals over time.
As for the die-off. i dont have candida or anything so i assume you mean some kind of other bacterial/viral die-off. it's possible but would something like that physically cause insomnia and repetitive or racing incoherent thoughts. These only happen when trying to sleep. Im not thinking like that while awake.