I've had this problem, the swelling in my face went right up into my eye,I went back to the dentist she said its going to burst soon so should feel better then,she also gave me two lots of antibiotics, I've since had another infection in another tooth while waiting for an appointment, I checked my gums virtually every day sometimes there was a little head forming with swelling so I'd get two cotton buds and squeeze the head till it burst then it felt better,perhaps for much relief you could look if you can do the same ,I promise it will feel better then once its burst whilst your waiting for your appointment ,i had a deep root canal on the tooth.good luck.