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The shutdown side of this system runs everything below your diaphragm. That is why going flat so often arrives with stomach trouble, bladder trouble and no appetite.
Those symptoms usually get treated as separate problems, or as nothing at all. Seeing them as part of one state can be a relief, and it makes the useful move obvious: work on the state, and mention the symptoms to a doctor as well. They often ease as the rest of you comes back.
Qur’an and Sunnah
'who sent water down from it and with that water produced things for your sustenance' (Quran 2:22). Feeding and being fed are part of the design, so trouble with them is worth attending to.
ٱلَّذِي جَعَلَ لَكُمُ ٱلۡأَرۡضَ فِرَٰشࣰ ا وَٱلسَّمَآءَ بِنَآءࣰ وَأَنزَلَ مِنَ ٱلسَّمَآءِ مَآءࣰ فَأَخۡرَجَ بِهِۦ مِنَ ٱلثَّمَرَٰتِ رِزۡقࣰ ا لَّكُمۡۖ فَلَا تَجۡعَلُواْ لِلَّهِ أَندَادࣰ ا وَأَنتُمۡ تَعۡلَمُونَ
who spread out the earth for you and built the sky; who sent water down from it and with that water produced things for your sustenance. Do not, knowing this, set up rivals to God
Qur’an 2:22read it in the library
Translation: M.A.S. Abdel Haleem, The Qur'an, Oxford University Press, 2004.
What the research says
A review and meta-analysis found depression associated with reduced heart rate variability even in people without cardiovascular disease, linking mood to autonomic regulation directly. Mood and body function do travel together through this system. That work is about heart measures rather than digestion, so extending it to gut and bladder symptoms is reasonable rather than demonstrated.
Kemp AH, Quintana DS, Gray MA, Felmingham KL, Brown K, Gatt JM. (2010). Impact of depression and antidepressant treatment on heart rate variability: a review and meta-analysis.. Biological psychiatry doi
Strength of evidence: one line of research. A single study, or a theoretical account.
Why it works
The same nerve serves the organs below your ribs, so a change of state shows up there.
When not to
New or persistent digestive or urinary symptoms need a medical check, not only a psychological explanation.
This one is still a draft. It is waiting on a scholar and a clinician to read it before it is published.
Near this one
A child who does not feel safe cannot filter the room. The pencil scratch, the scraping chair, the fan and the rustle of a coat all arrive at the same volume as the teacher.
Calm is not automatically the goal, and arousal is not automatically the enemy. What you are after is a system that can move between them.
Neurofeedback usually starts with an assessment, then a block of sessions, then a review, and it is mostly paid for privately. Ask about all of that before you begin.