Really just posting here for traffic. I ended up taking her to see a paediatrician privately and to have blood tests as the wait on the NHS was so long.
She has had fevers four times since October three to six days in length and going up to 41 on a few occasions and no other real symptoms other than a headache and chills. I took her in to A&E when it when up to 41.5 and they checked urine and she didn't seem to have a UTI so they sent us home and said it was likely viral.
I am just so worried about her. She is very pale compared to her usual skin tone and doesn't look right and doesn't want to do any of the things she would normally do, like cycling to school. She says she doesn't feel well all the time and still has a slight headache pretty much all the time and her "mouth and throat tastes funny", which everybody seems to think is irrelevant but she mentions constantly. She has shot up 5 cm since the summer but has lost 0.4 kg so she has gone from the 62nd centile on the NHS child BMI calculator to the 25th centile now. She's been properly sick (fever) for 18 out of the last 53 days, and missed 9 days of school since October. She has just moved to a new school in September which she absolutely loves, so it's not that.
I could tell that our GP (well, not our GP but the random GP at our practice -- we never seem to see the same person twice) thought I was just being an over anxious mum. And obviously they didn't think it was important as we still haven't heard back from them about being seen by anyone or having blood tests done on the NHS. I could also tell that the private paediatrician thought I was being silly and he also reassured me that she looked 'bouncy' and very healthy. She doesn't to me though, at all.
I'm so worried about the blood test results. I'm scared it's going to be something awful.
I kind of want to be told that IABU. That the GP and paediatrician are probably right. And that other people's children have had things like this and it was just a run of weird start-of-school viruses.