Starting to panic

I've been taking pictures of Fiona's head every month to watch the transformation from the surgery. I've emailed them pictures before when I was worried and they have always emailed me back saying everything was OK. Our last appointment was in April, we were told that we would not have to go back.
On Friday I emailed a picture of Fiona's head to Alan at Sick Kids, I was a bit concerned because her left side is really flat compared to the right, I got an email back saying that they want her to go for a CT scan in which she will have to be sedated again. I was NEVER expecting that answer in the email. They said that it looks like she had some bone resorption which I still don't understand.
I felt her head, the right orbital bone looks and feels great, the left feels like it sunk in and she has some soft spots around it.
I'm anxiously waiting for them to call me with the scan date, they said that they will try to get it done within the next 2 weeks if not it won't be until August because Dr. Phillips is off the last 2 weeks of July.
I'm so nervous, I can't imagine facing another surgery.