I had similar. What are they actually doing to fix it?
In my case they had a standard procedure, but it was a minor injury/outpatient/post-op unit that I went to, since I'd been discharged from the maternity unit/midwife care and the GP/nurses just couldn't handle it effectively in my small local practice. It was a unit of the local small hospital.
They used a rigorous routine of iodine patches, wound packing and repacking and cleanout. Then in the bad areas, some seaweed things and a host of other "more powerful" options as well as being on strong painkillers again (the pain during infection a few weeks after birth was worse than the initial recovery!!).
I suppose I'm concerned that you're not going to get treated effectively, waiting for a GP appointment - mine was seen as an emergency appointment, where I was told to go straight to hospital, and they were waiting for me, the first time it opened up.
Please make noise about what you need to get out of this and now (at a vulnerable time) advocate for yourself - i know it's hard when you're in pain and sleep deprived.
if it helps, i do remember there was 1 day where i seemed to suddenly turn a corner.. i realised i hadn't had stinging red hot pain all down my worst side for a few hours, despite not remembering my painkiller.. DH was inspecting the wound every day and that was the day he said the swelling and how "angry" the wound site looked seemed to be better... so hopefully (with the right medical management) you'll experience something similar.
But don't wait for it to get better - get onto them to get an effective medical plan in place to get you on the mend!