I'm certainly not arguing against trying different treatments and self-experimentation. If had a chronic illness I'd do the same.

I'm arguing against the experience of anyone person being applicable to anyone other than that one person. That why we have the FDA and randomized controlled trials. There are so many confounding factors that unless you test a treatment under very strict conditions, there is a very good chance you observed is completely unrelated to the treatment. Hell, drug manufacturers run trials and fall into that trap all the time.