It's OK, I went back today with general discomfort and the big top Dr did the full once over, pregnancy test et al. She said that I hadn't actually got PID (well done on the communication there...) but the antibios were a precaution 'cos the symptoms could be and they wanted to be sure.
In short I have still got pain 'cos my uterus is a grumpy old thing that needs a rest.
Panic over. Jeez, I wish they'd not tell you things they're not sure of.