I have taken tyrosine quite a lot for significant periods of time and did not find that it alleviated my ME/CFS symptoms, but rather elevated my mood and that was about it.
However, I do have a question for you:
I think parasitic infections may play a role in some of the hypersensitivity symptoms of ME/CFS. Babesia has been identified by Dr. martin Lerner and possibly others as a possible secondary infection in this illness, and one of the most well-known and most hypersensitive ME/CFS patients, Sophia Mirza (who could not tolerate light, sound, human company, most foods, chemicals, etc., and could barely move before she died), had a history of repeated bouts of malaria, which I read can become chronic with repeated exposures. I found when I got babesia from a tick bite several years ago, and ever since then, I go into a dramatic stupor-like state and have trouble maintaining wakefulness: I would not describe it as sleepy, but much more scary, i..e like being somewhere on the coma scale.
So I do wonder about CNS involvement of parasites in ME/CFS: toxoplasmosois, malaria for people like Mirza who might have traveled to areas of the world where they would have been exposed, babesia, etc. Is global hypersensitivity to stimulation (hyperacusis and beyond) common in cerebral forms of these parasitic infections? It does seem like a stupor-like state is common when they reach the brain.
And what about artemesia derivatives and tyrosine combined (artemesua derivatives for the parasitic infections, tyrosine for tyrosine depletion?).