Help!

My ex-girlfriend and I broke up a few months ago,her finishing with me because of lots of stress.We tried to be friends for a while,but it didn't work out because we were still attracted to each other,and stuff happened that perhaps shouldn't such as us coming onto each other.She said she didn't want a relationship,and she said that it was best if we cut off contact,not forever,but just for a while. I agreed that if that was what she wanted,then maybe it was for the best.

Now that was 3 days ago. Before we dated, she was my best friend, and I feel so low and terrible. I haven't been sleeping, and I've fainted twice since she cut off. I know I need to move on and leave it, but does anyone have any advice.