You may have some difficult opening and closing due to the trauma of the extraction to your jaw/TMJ area. Try putting some heat packs on it and stretch it out gently and treat it like a muscle injury. Try to eat softer foods to alleviate the stress on the muscle as well. Take the pain medication. I would call your dentist and let them know. They may prescribe some anti-inflammatories to help with the swelling and pain.
I would go back to the dentist- there is a chance you could have a dry socket... If so, the dentist can pack the site with some medicated gauze. If you were given some pain medicine, I would take it- if not I would get some ibuprofen(no Tylenol because that will thin your blood). I've had dry sockets and they hurt. Hope you feel better soon