Hello and Welcome to ‘Ask A Doctor’ service.
I have reviewed your query and here is my advice.
Exhaustion and feeling like the whole system shuts down before bowel movement indicates one of the following or a combination of the following:
Vaso-
vagal syndrome, overactive vagal response.
Colitis of some sort.
Anxiety and stress disorders.
This can be diagnosed by the following ways:
Consult your Doctor for clinical evaluation, examination and investigations of stool, blood and urine.
Ultrasonography of abdomen.
Colonoscopy and CT scan of abdomen if indicated by the Gastroenterologist.
Stop drinking too much water as this can cause
electrolyte imbalance.
Take full diet.
You can take warm tea or coffee on getting up and see the effects.
Control of stress and anxiety helps a lot.
If the colitis is proved then you will have a specific management.Avoid foods and beverages that instigate or enhance the problems.
Hope I have answered your query.
Let me know if I can assist you further.