Hi There,
Glad you finally got in! I think it is hopeful you got some immediate relief with the injection. Remember the cortisone will take some time to do it's thing, so hopefully even more relief is on the way. I have had a couple injections to my foot trying to reduce scar tissue from the surgeries. Similar reaction, my foot went ice cold. Probably something with the local even with no epinephrine so maybe don't worry about that too much. I experienced that both times and found the injections helpful after an initial few days of feeling kind of weird. Maybe things will calm down in there for you! Go Knee!
Littlepaw