I just wanted to say good luck and good on you for following everything up.
I do not want to try to post any 'advice' as I do not want you to have even more going through your head!
STOP GOOGLING though!!!!!

My DD is complaining of pain in one of her legs at the moment and we are going to take her to the doctors wednesday in the hope of getting some bloods or x-rays or something done.

My fingers are crossed that all the tests come back alright - I know it might be nice to find an answer but i hope that nothing serious shows up, I am sure it won't though!!
Keep us posted