My situation is a bit of this and a bit of that, so it's not a true fit with any category, but MLC is one of the pieces, although in my case it was my H's second MLC.
Honestly, I wish I had sought counseling for myself much sooner.
You mentioned anger issues. Those would be good to work on. You also mentioned wanting someone to tell you it's going to be OK. I found that learning about the importance of self-validating and working on doing that has been a huge confidence boost, and it has also made me much less needy.
Hang in there. It will get better.
Me: 44 H: 44 Kids: 20, 16, 16, and 10 Together/Married: 22 years H announced he was emotionally detached and considering D: 4/4/16 H announced he is going to try to stay and reconnect: 5/1/16