I've only just come across this thread. Slightly different circumstances here - my exP moved out at the beginning of December and I've gone through the worse few months of horror that I could ever imagine.
I don't know what pearls of wisdom I can attempt to offer, but the following have helped to a greater or lesser extent:
Sleeping pills/anti depressants. The anti depressants kicked in very slightly at the peak of me being suicidal and have kicked in further since. Sleeping tablets have enabled me to knock myself out most evenings as a reward for getting through the day. I'm still taking them, but planning to try and wean myself off them in the next few weeks.
Talking to people/crying on them. I've sobbed over more people than I ever thought possible these past few months. Neighbours, chiropractors, colleagues, distant friends, relatives. I've never cried so much in my life. But talking to people (and listening to their stories too - it's surprising how many people have fallen apart when a relationship ends) has helped.
Counselling. I have a really good therapist and it's been a lifeline.
Making plans. I've tried to avoid spending too much time alone as I know it makes things worse. So I try and spend as much time with DD, with friends, going out to do things, seeing people I've not seen for a while. Anything to avoid being at home and dwelling on things.
Books - I've read so much more in the last few months and found a level of comfort from different books. My therapist lent me "The Journey From Abandonment to Healing" - slightly New Age in parts but bits are helpful. I found reading Jeanette Winterson's "Why be Happy when you can be Normal" really helpful about how she fell apart at the end of one of her relationships. Also I've just re-read "Nothing Was the Same" by Kay Redfield Jamison which is a book about death and grief, but beautifully written and in a way relevant to the feelings associated with the loss of a relationship.
Um...I can't think of much else at the moment. I wish there was a magic wand that could take the pain away. I wish I didn't feel as bitter and broken as I still do, knowing that my ex has waltzed off and gone back to a "normal" life so quickly, whilst I am still a wreck of a person. I guess the silver linings at the moment are that I'm the thinnest I've been in a decade and I've realised how amazing my friends and family are. People have been so, so kind.