There could be a large number of reasons for the pain. Best thing to do for now however is to wait and watch for an additional week. If there is no improvement a fresh x ray and a new diagnosis is required.
In my experience of thousands of wisdom tooth surgeries however, I have had several patients with similar concerns who became alright after a few days of "wait and watch".
Next Steps
you should ask your dentist for a review or get a second opinion from an oral surgeon who specialises in such surgeries. in the meantime try warm saline rinses and a mild otc painkiller.
Health Tips
do not try to feel the surgical site with your tongue or finger. ensure the stitches stay on till it's time to remove.