The Strictly star, who is married to fellow dancer Ola, revealed Ella was initially sent home, but they made the decision to returned to A&E as she remained very unwell.
Sharing pictures of the three year old in her hospital bed, James explained what they had been going through.
He wrote: “My little warrior!! We are still at Pembury Hospital but she has finally turned a corner after 5 days and long nights of fighting an extremely high temperature.
“It started Monday but on Wednesday night things got pretty bad and temperature was 40+ so took her to A and E at roughly midnight where a doctor gave her a quick look over and said it was a viral infection and told us to continue with Calpol/Ibrofen and take her home and it would take its course.
“I did try to say it seems more like a chest infection than a viral infection but I’m not the expert. He also told us that it wasn’t because he had listened to her chest.”
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But things didn’t get any better at home, James continued: “After 2 more terrible nights of her temperature staying around 39 – 40 and her throwing up several times in her sleep.
“And even though we felt we were maybe wasting the doctors and nurses time and would look like overprotective parents – we decided to take her back to A and E.”
He added that the second experience at hospital was completely different – she was rushed to have an X-ray and told she had chest infection and tonsillitis.
James added: “They have now had to put her on an IV for the antibiotics because she’s been ill for so long and now very ill.
“Anyway, the moral of the story is – go with your gut parents. We knew it was something more serious. I’m just angry with myself I didn’t push harder. But to be honest I didn’t want to be a dick to them.
“It’s just a shame sometimes you have to because of some people’s incompetence. Then on the flip side, today we experienced the opposite end of the spectrum by sheer brilliance from a wonderful team of people.”
The pro dancer noted that his comments might not go down well with some people because it is negative about the NHS, but he insisted: “I will do anything for my baby girl.”