If I recall from indy's TPO, the first couple days/nights are tough, and tough on you emotionally. Hang in there, it will get better, and you will become increasingly convinced that you did the right thing.
Indy's monster vet, after Indy had her pelvis sawed through in 3 places, gave her no pain meds. Just thinking about those couple of days still makes me want to throw up. Sienna will have a much easier time, but it will still be a bit tough on the both of you.
Hang in there, so glad that she is home.