Please observe for a few days. Since there is a history of extraction in the area there will be discomfort for few more days. Swelling is normal after extraction. More so after an impacted tooth. Your healing will take some time, may be, even more than a week. Depends upon person to person.
The tenderness in RC treated tooth could also be due to the extraction site just adjacent to it.
Follow your prescription. If pain persists only take painkillers.
Next Steps
Start warm saline rinses thrice a day for a week. this will enhance your healing
Health Tips
Maintain oral hygiene. :)