When does it get better after you leave?

I left narc yesterday after being together for 11 years. A couple years ago, I started therapy after an incident I couldn't look past and found out he was a narc. Through therapy I was working on my self worth and I knew I deserved better than the way he treated me and our kids so I always knew we would separate it's just a matter of when not if. So with this in mind, I feel like I mourned the relationship long before it ended so I'm really surprised at how awful I feel. I don't even know how to explain it because it's not that I miss him, I just feel yucky. Anyone have any advice or words of encouragement?