Had rear lower molar extracted (due to abscess) about a week ago and now have a dull ache in adjacent molar (painkillers are still required). Biting feels uncomfortable and it "tickles", wouldn't call it pain, just sensitive to touch with top teeth (if I use my finger it is not sensitive). If I tap this tooth with the end of a pen it is painful. This tooth is free from decay and wasn't abscessed at the time of the extraction.

Could there be another problem? How long should I wait before going back to the dentist?

Any advice appreciated...