I've had some treatments that worked for a few doses, then stopped working if I took them daily. T2 was one of those. By experimenting, I found that it worked reliably if I took it once every 21 days, and the effect of a dose lasted the full 21 days. There's no guarantee that this will work for any other drug, but you might consider experimenting with longer-spaced doses, and different dosages. With LDN I experimented to find the minimum reliable dosage, mainly to reduce the chance of side-effects or having it stop working. For ME, doctors do not know the optimal dosage for a patient; they're just guessing based on dosages prescribed for non-ME diseases.