I'm sorry you're hurting but I have to :LOL I must be the oddball here, because I used to 'enjoy' my kid-free weekends. Gave me the time for myself, to read a book, garden, nap
or anything that I just didn't have time for during the week; working & taking care of kids, laundry, housework, etc... Actually, I did alot of my housecleaning & sorting through the kids stuff (while they were gone to fish out all their junk!)... I think at first, many years ago (my oldest is 22 now and her dad and I divorced when she was 18 months) that it was because I was still 'young' myself and still wanted to go out and have "FUN" (I was 18 when I had her)
Now, I NEVER get a kid-free weekend. I am a custodial SM of FOUR, on top of my own bio kids and the
BM rarely takes her 4 kids (she wont take all 4 at the same time, she only picks "2" at a time)
For me to get any ALONE time now, I have to insist that my Dh take our kids with him, going to the store or running errands, just so I can do that "dancing in my underwear" thing in my own house!!
I say find good use of your free-time, join a community activity, bask in the sun with a good book, bike ride, clean house, WHATEVER YOU want to do, relish the fact that you have some "me" time, because not all Mom's get that these days!
Remember, you gotta make some "deposits" in the Bank of ME ever so often!