DO NOT TRY TO LANCE AN ABCESS YOURSELF!
Anyone suggesting that is totally out of line! I have never heard any professional tell a patient to do that in 10 years.
There is a massive amount of bacteria released into your system if you were to do that. If you did, please every hour rinse with warm salt water and spit. Do not swallow any of it.
The only thing that will relieve the pressure is taking the antibiotics. You said you had a prescription, but didn't say if you were taking it. The pain pills are just a quick fix, and not a cure. Once the infection is taken care of, the pain will leave, but will take about 24 hours to get that medicine in you. Get that started right away.
The doctor can also open up that tooth and allow the tooth to drain in the office.
Once that has happened, you can either have a root canal done or extraction.