Hi

I honestly dont have an answer for you as to why this happens but I do know that my son, who has Tourette Syndrome, is not supposed to take tyrosine as it stimulates dopamine, and that in turn triggers more tourette tics

it does seem that some people react to certain amino acids negatively for a variety of physiological/biochemical reasons.

are you taking any meds as well....sometimes meds and some amino acids are not a good mix

here is some info on tyrosine from iHerb

and here is their info on drug interactions with supplements


dont know if that can shed any light on your exhaustion from it, and hope you find answers.