Oh, Christy, I'm so sorry about your ankle and hopeful that you will be able
to enjoy your wonderful trip.

I've taken care of a lot of horse ankle injuries and, from what I hear, the
treatment is very similar for humans:  first two days use ice packs; next
three days use heat pads.  The doctor should be able to prescrible a
prescription med cream that will help it heal.

Poultices are helpful:  comfrey is one.  You might call an herbal specialist
to find out what poultices they recommend.

A lot of athletes use Arnica cream or ointment.  Arnica comes from a flower
and is very helpful in relieving pain of this type.  I would buy enough of
it for use on the entire trip.  It will stay on until you take it off with
soap/water.

Best wishes for a really speedy recovery,
Kath