From my experiences with fire coral, the itching/hurting is usually gone after about a week tops, but the area can stay discolored (scar like) for a while after that. For me, the pain was always gone well within two weeks!
I believe they usually recommend using something like vinegar to kill any remaining stinging cells, applying heat to try to denature some of the toxin, and then applying something like hydrocortisone cream to reduce inflammation if needed, but that is all right after the incident happens. Since it's been two weeks (and I'm guessing you've washed the area), it is unlikely that there are still stinging cells present...
I've heard that some people react more severely to it and may experience discomfort for weeks/re-occurrence. These cases sometimes require medical treatment since the sting has gotten infected. Depending on how severe the pain is/how large of an area is affected, you might want to have it looked at!