Oh my goodness, I wish I could show you just how much better this is going to get!
You can download the couch to 5k podcast and start running (it's free)
You can take a really long bath with a glass of wine in the middle of the day and then have a nap on the sofa (in peace).
You can put some music on really loudly and dance around the living room naked.
You can lay on the sofa with a blanket and read a really good book or watch a film (in peace).
Use the time to be kind to yourself.
The first time my children went to their dad's overnight, I felt a bit odd. I had a takeaway and read a book and just didn't think about it.
And then after that, I decided that I was going to have fun. I told people that I needed them. I knew lots of people, but didn't really have any friends and, like you, they were all married, or busy with family or work... It was amazing, they all rallied round and now some of them have become good friends.
I found it better not to think about it in terms of I have them all week for all the shit and he has them at the weekend to do fun with them. Rather, I used to think I was the lucky one. I spend my life with them and now he only gets to see them occasionally. My children live with me, they visit him, and our relationship has got stronger as a result.
However, I would say that if you're at all struggling and finding it difficult to cope, go to the GP. They will help. There's no need to let this be more difficult than it is. My GP was fab.
You will be ok.