This can very well be as stated a very screwed die off or reaction to the supplements. I, personally, have found that my "detox reactions" or "metal mobilisations" etc are always nervous system related and they really are scary and feels like pure madness. I also needed one night the hand of my mother to have a solid reference (dont know how I would have dealt with it alone). Since then they dont leave me alone anymore in home hahahaha the crazy little boy. My symptoms and tests strongly suggest sympathetic dominance, as someone also said you could have.
I dont think your case or any other its hopeless. I have done a lot of testing and researching and I am 21 too with devastating symptoms and finally have narrowed my problems to heavy metal toxicity, nutritional imbalances, candida, parasites or even entities/bad attitude. Those are the real causes of all the hormones etc low or too high in all my HUGE pile of testing. See it as we will be cured at 23 or so, it all depends that you dont stop moving.
If I were you I would really try to get a GI tract panel if you hadnt already, need to rule out bacterias and serious things in your gut as other people already said. This is a priority since this symptom its so related with eating and its a serious thing for sure. Green stools are either bacterial etc infection or a copper dump, but they could be also bile or digestive enzyme related.
Did you get your hair analysis posted here? I want to take a look.