A biomarker would be tremendously helpful for me personally, as I experience moderate level of ignorance from my family and medical doctors towards CFS, which can be an issue at time when my functioning is lower, and also in the past I had to try to prove to judges in court that I had CFS, which might be a problem again in future, particularly as I now have what I think it is a separate but overlapping illness that again doctors can't identify or treat ( I suspect its caused by mold toxins but I don't fully understand how that can be possible ).