I've been in bad pain for a week now

I was diagnosed with endo a few years ago, I have a mirena coil and the pain is largely manageable. I got what I thought was an endo flare last weekend and I would expect it to subside after a few days. It didn't, so I thought maybe it's a UTI and got some antibiotics. A three day course hasn't made a difference. I don't have any discharge (I barely had a period), I'm not pregnant and I'm low risk for an STI. Has anyone had anything like this happen? I managed to get a GP appointment today, but often they aren't that well informed. The pain feels like pressure in the front of my pelvis and isn't on one side or the other.