(Which seems like everyone lately). I have no helpful advice to offer. Breakups are awful. I still have the ugly-ass stretch marks on my stomach from the time I couldn't eat, like at all, after a breakup and lost 10 pounds in a week.
I've just been listening to the album Days Are Gone by Haim, and thinking about what a good breakup album it would be (I especially recommend The Wire, Forever and Don't Save Me Now). So if you're looking for something to listen to while you wallow, I hope that helps.