How do I feel about my surviving twin?

Mandy • 29 years old - Married October 2013 - Mom of Baby Girl Dec 2015 😊 Expecting Baby Boy April 2018 ☺️
Lost one of my twins yesterday, and I'm just not dealing with it very well. I don't hate my baby, but I'm so depressed about losing one to heart failure. Has anyone gone through this? How'd you get past it? I feel like I'm never going to be excited about this pregnancy now...