I completely feel for you, the last painful break up I had was in 2010, the man had a very serious mental illness/personality disorder (I knew this, he was part of a support group I was in, he was and is a dangerous person, had been in prison twice for physical violence) and I should have never even been around him, much less get close to him. when he turned on me it was the worst feeling I'd ever had and although I tried to be strong, and most days I was, about a month afterwards I did end up needing to be in the hospital for the thoughts I was having. if for some reason you do find it difficult to get through don't be afraid to seek help...I told my therapist my thoughts and she let me know she was uncomfortable with me going home and told me to go to the hospital...I trust her completely so did as she said. It still took a while to recover from all of that. Be gentle with yourself, remember that this was not something YOU did, but something in HIM that made him react this way and say the horrible things he did.
something to remember, there are probably a lot of people online who are not entirely forthcoming with issues they deal with (I'm not).
I'm truly sorry for the hurt and the heartache but believe in this, you will get through it and you will be ok. Any time I think otherwise for myself, I just remember what I went through in 2006 (the year I got sick) and I know if I can make it through that I can make it through anything.

(((BIGGEST HUGS)))