. If a person has both ME and these other problems, it would be confusing to distinguish the source of symptoms.
Any stress generates the secretion by the adrenals of cortisol. The stress can by physical, mental, emotional, viral, bacterial, or an allergen. This process can weaken the adrenals when they have to work too hard.
Low cortisol/adrenal fatigue may include any of the following symptoms: chronic fatigue, weakness, apnea, insomnia, autoimmune issues, clouded thinking, muscle wasting, blurred vision, salt wasting, dizziness, shakiness, low blood pressure, impaired thyroid function, shortness of breath, allergies, and low blood glucose (hypoglycemia)
Adrenal fatigue isn't really a thing. I read just about every book I could get my hands on when I first got sick on adrenal fatigue, and it was all very confusing. I couldn't figure out if I was stage 6 and nearly dead or stage 3 or what, but I never had the high cortisol that proceeded the low cortisol And I was doing everything that the experts like Wilson recommend without any improvement.
Most endocrinologists only recognize Addison's disease and Cushing's disease and if you don't have either, they won't help.
I had low morning cortisol but not devastatingly low, my cortisol was lower at 9:00 a.m. than it was at 6:00 to 7:00 a.m., which only became evident when doing a 24-hour saliva or urine cortisol test. I also did an ACTH stimulation test, which dictates a certain amount of rise in cortisol production with stimulated by ACTH, and mine didn't rise the stated amount, though it did rise a bit. So an endocrinologist Saw it and said I was normal. I checked with other patients online, and with my ME/CFS specialist, and all said that it was abnormal, and that I had adrenal insufficiency which is on the road to Addison's, but not yet Addison's. I also had low aldosterone which is also produced by the adrenal glands.
Both my functional medicine doctor and my ME/CS best specialist thought I should be on replacement hydrocortisone, so I started at 30 mg a day, then, as We treated other problems, like infections, and I improved, I was able to reduce it to 25, then 10, then 5 and 2.5, then 1mg a day over a period of about 2 years. I also take the Vital Nutrients Adrenal Support product and keep vitamin C at an adequate level.
Again, no amount of following "adrenal fatigue" advice was helpful. There was a time when I was drinking five cups of espresso a day to stay awake, And then it got to the point where the caffeine did nothing, and I could drink the coffee and 5 minutes later be sound asleep. I knew I was really sick then. I had also tried not drinking coffee, and it didn't care my adrenal fatigue, I was just worse.
A person with a "normal" cortisol test reading may suffer from adrenal fatigue.
It is worthwhile to do a 24-hour saliva or urine cortisol test, ACTH, an ACTH stim test (which is usually fine at a large clinic with a lab or a hospital).
A good read from Amazon on adrenal fatigue is: "Adrenal Fatigue, The 21st Century Stress Syndrome" by James Wilson, N.D., D.C., PhD.
Though there's some decent advice in there, The main issues for ME/CFS patients, like infections, autoimmunity, nutrient deficiencies, hormone deficiencies, CCI / Chiari, POTS, MCAS, EDS, microbiome disruption, etc. are likely contributing to the load on the adrenals, and treating them will likely improve things.
I do not have ME, but I have suffered from CFS with PEM type crashes due to AF and hypoglycemia. This includes three years in bed about 95 percent of each day.
You have stated that ME/CFS can be confused with adrenal fatigue, Or at least, that patients would be confused by this. I don't find it very confusing. I have ME/CFS and several of the things that put me into a subset of patients that put a load on my adrenals. I found with adrenal insufficiency, I needed to supplement hydrocortisone, which helped my day-to-day function, but did not make my ME/CFS go away. I also learned that if my body did not have enough cortisol, either that I have produced or through hydrocortisone supplementation, when my body had an extra stress, I went into adrenal crisis, which can be life-threatening. It manifested as fatigue initially, and then within 36 hours, I had excruciating pain at the top of my kidneys where my adrenal glands are, and taking either dexamethasone, a steroid, or a high dose of hydrocortisone, immediately caused the pain to go away, only for it to return when the steroid wore off And that I had to be on a high dose for about 3 days and then taper down to my usual hydrocortisone dose over about 2 weeks.
Obviously, working with a doctor who knows about all of the above would be useful, particularly as prescriptions are needed for the steroids. And, warning any doctor before trying a new treatment about your adrenal insufficiency is wise. I got caught because a doctor didn't take it seriously and cavalierly gave me an IV medication for another condition that triggered the adrenal crisis, without explaining the potential side effects. I believe they also make alert bracelets if this is an ongoing danger.