I think most of those protocols are self-prescribed. I also wonder if many of them aren't actually doing what they are believed to do. If you're taking dozens of supplements every day, how can you be sure that each one is actually doing something. Regular testing, by not taking them for a period of time, seems important. I've encountered plenty of things that seemed to give a benefit at first, but then stopped working.
Also, as far as I know, no doctor can properly prescribe treatments for you. No one knows what chemical mechanisms are involved, so no one knows how to correct them. Also, we all seem to respond differently. One person benefits from supplement A, while another finds that it makes their symptoms worse. The complicated protocols that one person swears by seems almost guaranteed to not be optimum for anyone else. We each have to figure out what works for us, and what things to avoid.
For me the most important tool is a daily food/activity/symptom journal. Our memories are too unreliable, but a journal allows you to go back and verify that you consistently feel better or worse after "x". Feel unexpectedly worse one day? Check back, and find that you tried a new snack, or switched to a different brand. I've been surprised at some of the correlations uncovered by my journal.
I didn't discover my effective PEM blocker (cumin) until year 15 or 16, but it makes a huge improvement in my quality of life (can do physical stuff again without PEM), so don't give up experimenting and hoping to discover something that works for you. No doctor would have suggested cumin, or T2 (my other reliable ME treatment). Both of my reliable ME treatments were accidental discoveries. Maybe an ME specialist's suggestion would work for you, but I don't think that the probability is any greater than for something you decide to try for yourself.