I can't emphasize enough how important it seems to me to tread very carefully around any discussion that suggests there might be an emotional
cause for ME/CFS. We have all been victimized by the ease with which ignorant and helpless doctors toss us out of their offices with a suggestion to meditate or get some psychiatric help. Not having our physical reality acknowledged by a clueless medical profession is as old as....the medical profession.
With ME, I think we're all exceptions to the rules...and we don't even know what the rules are.
However, I feel that in MY case--and again, it is critical to say that we all have things in common and yet most of us have our own unique manifestation of illness--there is a connection to something akin to--but not anxiety. A physical manifestation of anxiety if you will
I believe, after studying myself for a number of years, that something failed (or got stuck) in my ANS, which had here-to-fore enabled me to manage stressful situations successfully. The cause of the failure/stuckness had nothing to do with my mental health and was entirely the result of physical stress on the body.
I had led a pretty intense life with many challenges and I rose to them. I could get pretty wired, but I was an expert at bringing myself down again when the peak had passed. After a stressful bout of pneumonia (no health insurance, free clinic doctor off-handedly telling me I didn't have pneumonia but lung cancer, then prescribing Cipro, etc.) that ability left me. I found that I could no longer regulate my nervous system. Even when settled down, the smallest thing in my environment or in myself (and it could be anything--emotional, physical, mental) produced exponentially expanded reactions. All the physical signs of panic---the sympathetic nervous system on HIGH. I started to wake spontaneously multiple times at night with surges of cortisol.
This is just part of my experience with ME, POTS and connective tissue disorder, but it feels important, salient to me. If I cannot rest, then I cannot recover. If small tasks loom like the Matterhorn to be climbed, there is a constant looping between body and mind telling me that I am unequal to my life. And that is stressful. A stress I think we all know--to contemplate a simple obligation and feel unable to meet it. To have to redefine your identity based on limits imposed by the body.
I know it is likely more complex than this, but
the HPA-axis / pituitary research publications outlining how its upregulation causes ongoing production of cortisol and adrenaline and their correlates which in turn manifests symptoms.
To call it anxiety is too simple in my opinion, but there is most definitely a connection in my body between the constant activation of the sympathetic nervous system and many of my symptoms.