vrb,
These first days will be hard. But I am so proud to read your words. You are doing what you need to do to divest yourself of someone who really doesn't seem to give a damn about you. You're better off alone than with someone like that, but you knew that.
You just have to struggle through these days, as it WILL get easier day by day. Keep busy, eat right, get good sleep (take melatonin if you have to; it's natural) get fresh air. Take tender care of yourself, as though you were getting over being really sick. You are.
It's hard to have to work with someone that's blown you off. Do you have to stay there? Is this an opportunity to find something even better?
Hugs to you -- you're doing the right thing.
GL