I had a tooth ache a few times for which I suspected I was grinding my teeth.  While the area does not hurt, not sensitive to touch or hot/cold, I now have the sensation in my lower right cheek adjacent to that tooth that appears may be slightly swollen, but the sensation is that of wearing off Novocaine.
Thanks for posting your query to Chat Doctor. I have gone through your history. You should visit a dentist for complete oral and radiological examination of the concerned tooth as due to tooth pain history you might need a root canal treatment. Till then, you can do warm saline rinses 3-4 times a day and take a painkiller like Coquitlam for mild pain or Retool DT for severe pain 2 times a day. Hope my answer will help you.