I can relate with you. I'm alot like you. I make my partner and my kids my ENTIRE life. And when they are gone, I'm left with absolutely nothing to fall back on. This is called codependency and it's very painful.
Today has been very hard for me and I am running on fumes. No sleep combined with anxiety is enough to make someone crazy.
Your wife just moved out so this is all new to you. It's quite a shock to your system when you become physically seperated from your family. I'm going through it too.
I wish I knew the answer to help take this pain away. Hang in there buddy, I'm not doing well either.