Really sorry to hear your news - you have obviously given loads of love to Dex and the little girl gave you much in return. Tomorrow will be hard - believe you me, I went through the same ordeal with my first beardie and was crying at swanbridge vets for quite a while, but try and think of the good that you did helping her and that she'll be up in beardie heaven.
In time you will find it in your heart to help another beardie. There is a beardie rescue service in Hull (now Reptile Land on Anlaby Road - let me know if you want any more details about them in the future), and I'm sure that a caring person like you will be happily received when you feel like you are ready to help. You can't replace a beardie - but things will get easier. Swanbridge vets will treat Dex and yourself with dignity and I'm sure things will go smoothly.
Take care.
In addition, sandi0906 - I hope there was no misunderstanding - 'invaluable' is a compliment - I would have been lost without this forum when I became a beardie carer, especially when I had problems with my first beardie. Please be careful about making comments without being sure of meanings - but if it was an innocent misunderstanding, then nothing is lost and apologies all round! This forum and the vast majority of its members are simply brilliant.