I'm very sorry to hear this news, but Darwin is very lucky to live with you. For me, you are the standard of how to organize the life of a dragon, I believe that many interesting adventures await Darwin. I wish Darwin a good trip, maybe he'll even get to lick his favorite maple walnut ice cream.
I hope you get your road trip. It's not fair that we fall in love with these little guys and we get so little time with them, and then something like this happens to make your time together even shorter. I'm sure he has loved every day with you so far and appreciates the good life he has with you.