Ugh, I feel your pain. My lawn is grossly overgrown; my car is registered for the first time in a couple of years, but it's still falling apart; my dogs are well-fed but barely walked; I'm a few years behind on my dissertation; I hardly ever have the time to talk to my family; there are piles of laundry littering my house; I have no food in my refrigerator; my plants are dying; some bills may or may not be paid; my ants love dirty dishes; oops, I forgot to put the garbage out last night; I still forget my treatments from time to time; and etc!!!
The point is, that we are only one person, and there's only so much we can do - I gave up caring if my neighbors thought I was low-class a few years ago! I do the best I can. S@#t rolls downhill, and even the Mona Lisa is falling apart! I still take the time to paint, watch movies, and BBQ with my friends - these are the truly important things. I frequently wish I had a partner to help out, and am seriously envious of my friends who have such a life; but right now, I don't.
My advisor's spouse once complimented me on how well I organized I was with my life. I laughed and thought he was joking. But, I thought about it later, and realized that heck yes, I deserve some credit! So, it's okay to feel scared and overwhelmed - few people face the challenges that we do! Hell, you deserve a medal for dealing with life so honorably [maybe we can all start giving each other awards <img src="i/expressions/face-icon-small-smile.gif" border="0"> ]
At some point you may need to move back in, and that's ok, there is no shame in that. My (almost) fiance left me too, and while it's tempting to blame myself, in truth I know it was her deal, not mine. I'm going to end this rambling post STAT.