Hi Roddy,
I have recovered from a severe case of of Adrenal Fatigue Syndrome (AFS). All my insomnia, cortisol, sugar craving / hypoglycemia, racing anxiety type symptoms went away and have stayed back. It took me at least 1.5 years of hard work.
All the the supplements you are prescribed can be useful for adrenal fatigue syndrome. All of them, used at different times, helped me.
I followed Dr. Lam's protocol which is first to titrate up dose Vitamin C and B5 (pantethine & panththeonic acid) and help support the adrenal glands' hormone production with those. Once a degree of stability has been achieved... then I added herbs and hormones. Herbs like licorice and ashwaghana... while can be helpful... can be 'addictive' and cause crashes if you take them away. Not to say you shouldn't use them, but breaks (5 days on, 2 days off) can be helpful.
HC is extremely addictive. It will probably give you help quickly, but it may be difficult or excruciating to ever get off. It is not considered a 'first line' treatment in all but the most severe, debilitating cases of adrenal dysfunction.
I would recommend
Dr. Lam's book on Adrenal Fatigue Syndrome if you want more detail info on the topics I discussed. It is a little bit complex and was very difficult for me to read when I had severe AFS and brain fog, but somehow I got through it and survived.