Firstly, for testing supplements and drugs, I find it
absolutely invaluable to keep an ongoing diary (daily journal) on my computer in which I write down every drug or supplement I take on each day. In this diary, I also write my observations regarding any interesting changes in ME/CFS symptoms (symptoms improving or worsening, or new symptoms appearing). My diary system is explained in
this post.
Secondly, an important part of my testing system is
planned starting and stopping of the medication or regimen under test. This is because I find you only really notice the benefits of a medication when you first start it (because that's when the benefits first appear, and you notice the change), and when you stop taking it (because that's when the improvements will tend to vanish again, and you notice the change). See
this post for more details.
The third part of my testing system is finding and making use of
natural objective measures of health level: this means finding reliable
objective measures of your symptom levels (what you are capable of
doing today), rather than your
subjective assessment of your symptoms (how you
feel today). This idea is explained in
this post and
this post.
I hope that helps.