sorry you are having troubles!
If you are out of pain meds altogether, you could go to the emergency
room - but it generally costs a lot, and the biggest problem is they do not have Dentists
on staff. The Physicians can write you a prescription & that is about the extent of what you can expect from an emergency care facility/hospital.
If you CAN make it till tomorrow, you could call up your Dentist & he can see you, rinse it and do anything further to alleviate pain (eugenol dressings, etc.), together with writing you a new pain med prescription.
Lastly, this will tend to help (with time), try to rinse every 4-6 hours with warm water. It will clean the extraction site better, where food can build up & possibly be causing some of the sensitivity
I know this will go away for you soon. I just hope it's really soon!
Best wishes to you... Hang in there ( - :