Take ibuprofen, not tylenol, for the next few days (ibuprofen is an anti-inflammatory, as well as an anti-fever drug; tylenol is mostly for fever). Continue to ice as much as possible for 24 hours following injury, and keep it elevated. Then, after the first 24 hours, alternate cold therapy with heat therapy (you can easily do heat therapy by wetting a washcloth completely, wringing it out until damp, and nuking it for 45 seconds or so (it will be hot, so be careful, and use another layer between it and skin if needed). And continue to keep it elevated. Wrap it, if you know how, if you have to walk anywhere.
Call the nurse line for more assistance. If it doesn't improve noticeably by the 2nd or 3rd day (swelling down, less pain), go to the doctors.