In reply to ojp:
If you have on-going numbness, this is frostbite, not frostnip.
Any persistent damage - whether it be numbness or actual tissue damage - means that your fingers, toes, ears etc have suffered freezing cold injury. Obviously there is a spectrum of damage from (for example) toes that remain numb for three months or so (relatively superficial damage), to toes that blister, turn black and eventually mummify or require surgical amputation (representing destructive deep tissue damage)!
By description you have suffered what we would classify as Stage 1 frostbite.
As for treatment:
1. do not subject these injured toes to freezing again this season
2. take aspirin 300mg daily or ibuprofen 400mg twice daily for two to three weeks
3. apply aloe vera gel to your feet for two to three weeks (contains vitamin E - essential for collagen, which is one of nature's building blocks)
The suggestion to use alcohol - while eminently appealing - is based upon mythology.
A common example of frostnip is blanching of the ears or tip of the nose, which very quickly disappears when the area is shielded from the wind and warmed.
It might seem to be a pedantic difference in nomenclature, but it is important not to diminish the fact that tissue destruction has occurred (i.e. the nerves in your feet are damaged) just because your toes haven't turned black and fallen off!
The practical significance of this is that your feet are now very prone to further - cummulative more destructive damage - if you allow them to freeze again this winter.
Hope that this helps.