Welcome KeepMoving,

Sorry you have to be here! it is a great place for support. It is good you are treating symptoms early with the prednisone. I hope that helps you. FYI, coldness, color change and numbness do sometimes occur with ankle sprain - just Google "ankle sprain cold foot". This can be caused by nerve or vascular compression that has occurred because of swelling and or the injury. Swelling from injury can take a long time to resolve and nerves are persnickety little buggers that don't always handle pressure well. If you have not had a nerve conduction study or any vascular work up it could be worth pursuing. Don't wanna miss anything treatable that might be contributing! Welcome to the forum, you will make it through this.

Sending Healing Love,
Littlepaw