Leokitten, Aleks
On why TH! may remain active. (It may just be ongoing infection, of course)..
Post sarcoidosis fatigue which occurs in a significant percentadge of "recovered" sarcoid patoents may be instructive. it is believed to be TH1 mediated as is active sarcoid. PSF symptoms overlap with ME/CFS/FM spectrum. Active sarcoid inflammation with granuloma is apparently resolved, thoiugh there may of course be occult granuloma..
It has been speculated if granuloma are absent that TH1 remains active post sarcoid due to LOW adrenaline in a post "knock put"illness state and for that reason some patients have been treated with exercise to get the adrenaline pumping. It may be very controversial to promote exercise/behavioural activation in any form fro ME/CFS/FM, but I have often wondered if e.g. Lightning Process rather than lowering adrenaline might actually work by raising it, in some cases where it is claimed to help..
(Of course if candida and adrenal suppression + potassium loss have set in due to steroid administration in a sarcoid patient then raising activity alone will not work).
On cortisol/catecholamines
Is it possible that activated sympathetic response may be a way of producing cortisol to dampen down inflammation in earlyish stage infection or autoimmunity? I have certainly had periods of high cortisol, but also of low. Further the diurnal aspect must be remembered - illness is exhausting. You might be fired up to produce cortisol against inflammation at one time of the day, but be unable to sustain production, with a diurnal boom and bust pattern for some months into illness and a declining pattern of lower and lower production as time goes on unless the cause of the inflammation is resolved. Catecholaminse might follow a similar boom and bust, then declining pattern.
Later reactive depression, with which many of us are familiar, may raise both catecholamines and cortisol again, if the system is strong enough to sustain a response, creating more confusion.
On psychological stress
Imo we must be careful not to dismiss psychological stress or be open again to accusation of mind body dualism and denigration of mental illness (unwarranted accusations of course). It is now believed that psychological stress can alter bone marrow production and promote inflammation, offering an insight into bio mechanisms but also implying that psychologuy is important in some inflammatory disease. This may please the shrinks and will not be news to e.g psoriasis sufferers, but the correct deduction would not be "see a psychotherapist or remain voluntarily ill" but "yes, stress can make us physically ill, so we will treat the physical illness for that very reason, and the stress too, as we might in e.g. psoriasis, diabeted,".
Overall too many things going on in too many people over too long a time to tie things down definitively..