It is scary when you've been fighting for so long to get anyone to take you seriously, and then suddenly they do take it seriously, and by association, validates all your secret fears. Yup, super scary.
But the thing to remember is that they aren't dating your worst fears might come true. They are just saying that your dd is poorly enough for them to start treating her pain and symptoms seriously... In the way they should have done a long time ago. Try and remember a while ago, when things were bad but not the last few days 'runaway train' type of bad... They're doing what should have happened then, when it was worrying but an awful lot less scary than now after such a tense and awful time.
Don't worry, at least, try not to worry too much. You poor thing, and dd too

Ps I was told to eat a few spoonfuls of jam to help with horrendous impaction after had discharged myself from a horrible hospital stay, and was doing anything not to be readmitted. Jam along with enemas and other less tasty things, I'm not a crank with a wonder cure of a teaspoon of strawberry jam :)