hello I'm back - sorry for the last message being so rushed, DS was mid-meltdown and I couldn't finish what I was saying!
I'm really sorry you are going through the same thing :( I've moved back in with my mum and dad since Feb, found out about OW in Jan. It's been pretty traumatic for me and my DS, so many emotions run around and it takes a while to settle. I've not managed to move into my own place yet, and have another baby due in 5/6 weeks so probably won't now for some time. It feels very odd being home with my parents, and really scary thinking of doing it on my own as well. I think you've been really brave to move out and be just you two - I know how overwhelming it can feel even with a partner sometimes with a baby, and don't forget 8/9 months is prime separation anxiety stage regardless. With DS at that stage I often had to resort to driving him to sleep in the car because the hysterics were too much! It drove me up the wall even without the stress of a separation. Try not to blame yourself if he is a bit unsettled, try to think of it as a normal stage - one of many that includes crap sleep!
I also slept in the same room as DS when I first arrived at mum and dads and he got very clingy and used to me being there. The pull out bed by his cot has been a godsend, I'm 33 weeks pregnant now and I had a few truly awful nights when he wouldn't settle in the cot, wouldn't sleep in my bed, and I ended up sleeping under a toddler duvet (yes, me and bump!) on the carpet next to his cot. I find having the option of just pulling out something I can nap on takes some of the stress out of it for both of us, I don't panic if he takes ages to settle, he gets to see me while he drops off but at the same time goes to bed and wakes up in his own room/cot every night. It took about 3 months for him to get used to the third new bedroom in a row but now he pretty much sleeps through again and I'm back in my own room (thank god - just in time for the truly sleepless nights and new baby to kick off!). Give yourself a pat on the back and don't forget you are doing an amazing job of being a mummy under extremely difficult circs. I don't know why you split but it almost doesn't matter - the reality of being a single mum is a big mental adjustment no matter whether it was your choice or not. Being good enough is good enough right now, compromise on what you can and congratulate yourself for every achievement. In a few months you'll both have moved on (you and DS that is) to a whole new stage anyway.
I've had some extensive and fantastic advice from MNetters - here and here for starters. I also started a blog about it all!! I find talking (typing) really helps me feel less lonely and overwhelmed so do get in touch if I can I'll hold your hand anytime x