I've had one drained and packed, but now its back!

Hi, my name is John, roughly about a year and a half ago, i had a pilonidal abcess, had it for about a week before i went to the doctors, they done the usual antibiotic course, but that did not help as i had a reaction to them, so of course i went back feeling really unwell had a lowgrade fever, so he sent me straight to hospital to have it drained and packed over the corse of six weeks. Now that went really well, i healed as planned.

Fast forward a year, and the dreaded thing is back, bigger (now stretches across both cheeks) and more painful than last time. paracetamol and ibuprofen doesn't even help now, ive got an appointment with the Doctor later today. What other treatments are there? Im based in the UK.