As already stated on here, antibiotics work by targeting the infection, not by killing the pain. The infection usually gets scaled down by the end of one week after the start of antibiotic use, unless it is a particularly virulent infection. Even if the infection appears to clear up, don't forget to finish your course of antibiotics! Else it could come back and worse.
You need a good painkiller, so I would advise paracetamol or ibuprofen. But CHECK the antibiotics in case they specify that you can't take ibuprofen whilst on them, because some are a bit weird like that.
As painkillers take some time to work, and sometimes don't work at all, I would also advise getting hold of some clove oil (ask at a pharmacy) and applying it using cotton wool, to numb the area. It tastes awful but I suppose you're not meant to drink it lol. It really works though, stops the tooth being so sensitive.
Hope that helps xxx