This is one of the best and most fast acting natural anxiety remedies, that you can buy OTC, (or well at least in some countries/states), it's available online on amazon.com and e-bay and there are other

This one is most efficient (especially for the ladies), a bit of a strange substance, it used to be called vitamin B8, but it's no longer considered a vitamin... Inositol is a "carbocyclic sugar".