If you have no pain associated with the wound and if doctor has taken x-rays and no abnormality was detected then it may not be related to tooth. You may be experiencing symptoms or sinusitis . If bending or moving your head side to side worsens the pain then it is in all probability sinusitis. Avoid direct fan or ac , cover face while sleeping and do hot fomentation (dip cloth in hot water and apply over the temple and areas of pain). This should only be done after the wound has somewhat healed not immediately after extraction. In case the extraction socket shows loss of clot (dry socket)severe pain can start and usually dentist gives packs to cover the exposed bone. If pain is of that nature visit your dentist again.

Get your dentist to check whether the bridge has high points.

There might be few reasons for your symptoms. If the wound following extraction is healed than get the bridge checked for any high points.