Firstly and most importantly 
, I’m sorry you have had to experience this. It is a horrible situation and one that unfortunately most breeders will go through at some point or another, sadly yours happened so early into your investment.
Dealing with a loss can be extremely difficult at the best of times, especially when you have more than just a emotion link, in this case financially.
Do your best to keep calm and take any opportunity you can to go for a walk at some point today. Find somewhere close by with a bit of history that you can research or just anything to clear your head for a hour while your out. It will help.
As for what to do with the actual snake, you can check out this thread that has some suggestions… How do you deal with a loss
Please please dont let this discourage you though, by the sounds of it you have been doing a amazing job rescuing animals for years, the reptile world still needs you.
If you would like to talk privately, even about anything off topic, I’m only a message away. We are here for you