Tired

I've been running myself ragged for the past month and a half since HE left me, and I think I finally hit a brick wall today. I just have no energy to do anything. I've been out of milk for four days, but can't seem to find the energy to go out and buy some. There is a whole list of housework and other things I need to do, but I can't seem to get up off the couch today. It's almost like the past month or so has been this huge adrenaline rush, and now it has worn off. There is just no motivation left. Maybe a good nights sleep will help. Any suggestions?