You're gonna be alright. I know it doesn't feel like it now, but you will survive her moving out of the house. Trust me. I know from experience. It takes time, and you have to just survive day by day. You'll be in survival mode, you'll feel weak and awful, your performance will slip at work, and you won't be yourself. It's normal under these circumstances. You'll lose weight because you won't feel like eating. But, YOU WILL SURVIVE IT. It's a hard lesson, but you will learn it. You will learn to be in the house by yourself. You can't prepare for it at all though. It punches you in the gut, and you don't think you'll be able to take the punch...but you will. Trust me. Stay here and learn, talk to others, and as time goes by, after you've been alone in the house for a little while...you'll remember how you thought you couldn't do it...but you did! It will happen...not overnight...it takes time...but it will happen. It doesn't mean anything either...other than you realize you were able to do something that a short while back you didn't think you'd ever be able to do. I know you don't want it to happen...so does she. Keep working at it afterwards also. There's always hope.
"Always go straight forward, and if you meet the devil, cut him in two and go between the pieces." - William Sturgis, clipper ship captain, 1830's.