Hi Glenn, in addition to as much vocal rest as possible, keeping the throat warm and hydrated brings added blood to the irritated throat-larynx and help speed up healing. To keep your neck area warm, remember to always wear a scarf around your neck when you go outside.

I also highly recommend using a personal steamer-inhaler 3-4 times a day:

Vicks Personal Steam Inhaler

If the problem contines to persist, I recommend seeing a good otolaryngologist (aka: ear, nose, throat specialist) with experience diagnosing & treating professional singers. Good luck.

Scott