What I suggest you do is to write down as much as you can recall of the conversation that took place with the locum? consultant - start at the beginning of a 'he said, I'said' account and keep it factual.
Once you've committed your account to paper, I suspect you'll be able to 'put it bed' for the night and pick it up again when you are able to discuss the matter (out of earshot of your dd) with your dh and decide what form of complaint you intend to make.
Please let your dd's GP know what has occurred and ask if s/he or a practise nurse can help reassure your dd that the quack she saw today was talking out of his rear end or, as has been suggested by biddy, that there may have been some mix-up with patient notes/names.
In the meantime, give your dd as much reassurance as possible - there must be some tales on the net of patients with similar ailments/experiences having positive outcomes that you can show her - hopefully involving proud mums of 1 or more dc - and it's never too early for a child to learn that adults, even medically qualified ones, can and do make mistakes.
I'd like you to know that I feel extremely angry on your behalf and also outraged on behalf of your dd. The doctor you saw today needs a serious pull on what is, and what is not appropriate, when treating young patients and if your dd is seen in a paediatric unit - shame on him.
Just a thought - could the 'consultant' you saw today be your dd's usual consultant's registrar acting in absentia while his senior is on holiday? If so, it is within your power to make sure he gets his bollocks put in the mangle by his boss - and please ensure the handle gets an extra turn from me and all of the other mumsnetters who will be similarly outraged by this insensitive dr. dickhead.
In respect of waiting until your dh is home before letting him know what took place, you have no choice but to keep your counsel until you see him because if he rushes home your dd is going to have even more reason than dr twat has given her to fear to worst. If your dh has an issue with you temporarily keeping this from him, show him this thread.
Finally, have a
- you deserve a couple of bottles.