foxfire, I feel your pain. It must be the season for it. Bloody women!!!
The last time I had my heart badly broken, I went out to the local dyke bar (there’s only one in this backwater town) and got myself horribly plastered to the point that I couldn’t walk in a straight line. I did this every Friday night for four or five weeks. Not exactly healthy, but hey… it numbed things a little.
As for stuff that is less likely to kill brain cells… I found that travelling to another city for a weekend away really helped - I went to Sydney for a weekend, did all the touristy stuff. Treated myself to nice meals with a newspaper for company.
Also, because I am a volleyball nut, I threw myself back into competition. I played several nights a week and found the exercise helped me vent some of my frustrations.
But most of all… I cried and cried and cried some more, and when I thought I was done crying, I found my friends and told them how crappy I felt, cried some more, and let them soothe my wounds.
I know these aren’t exactly solo suggestions (except the travel), but I found they worked for me. I hope you and your ex sort things out.