I would suggest you to go to a dentist and get an Xray done of the tooth where you are experiencing pain as there are chances of tooth fracture due to which you are having pain which is gradually increasing day by day. It is likely that adjacent tooth can get fractured due to traumatic extraction.
Also the pain can be due to tooth movement and if this is the case than you don't need to worry as the pain will go gradually. So till the time you see a dentist, just take any over the counter pain killer. For more info on dental pain you can visit the link...http://www.identalhub.com/dental-knowing-all-about-dental-pain--539.aspx