Not nice is it corylus?!
I'd recently been in agony with pain in a top back tooth, dosing myself up with painkillers before getting to the dentist.
The x-ray showed an absess & I was given antibiotics. The pain subsided & I haven't had any problems since, thankfully!
Having said that, the dentist said if the pain does comes back, I could consider either having root canal work done, or having it removed, as it's so far back & I don't need it for chewing!!!!
Needless to say, I'm hanging on to it & will go back in 6 months time for the usual check up!
Hope you get sorted out soon, take care.