Hi Ruffles,
It's not your fault someone doesn't know what remedy to give.
Natropaths are not homeopaths, IMO they should leave homeopathic prescriptions alone. I've had treatment from an ND, with good results, but not homeopathic remedies.
If a remedy is taken you can usually see some change ranging from instant to within a few days to a month. A properly selected remedy will boost your emotional/physical levels so that you can tell something has happend for the better.
If it happens to be the wrong one then nothing will have an effect, or you will feel depressed, at which time an antidote or a proper case should be taken again.
Hope this helps.
Regards