Beware of the Post hoc ergo propter hoc fallacy. (Latin for "after this, therefore because of this"; temporal sequence implies causation) – X happened, then Y happened; therefore X caused Y. If you try a treatment and there is an improvement, it does not follow that the treatment caused the improvement, because there might be another explanation. To prove that you need to perform a proper scientific trial. If the treatment has been shown to be effective it will be available on the NHS.