OP I feel for you I really do. I think you need to let your DP have the children for two Saturday nights a month so you can read a book, chill out, go for a spa evening with a friend or family member, or even better on your own, go for a wander around the shops, have time for a new hobby etc just to give you some headspace!
What I am about to say will probably cause offence to many but I’m afraid I need to say it.
I don’t think I want children and its posts like this that only serve to confirm that thought deeper. I am so fed up of seeing post after post after post like this on here. For goodness sake, why do people carry on after baby no 1 if it’s that difficult?! I honestly cannot imagine the stress, money and time that 3 children would bring and need.
People really need to think before having children and if 1 is proving miserable and stressful for god’s sake don’t go having another, or another after that!!
I’m sorry, I am NOT having a go, though it may seem like it and I know this isn’t advice and doesn’t help you but it just seems to be never ending posts like this on here (I am aware it’s mumsnet so where better to vent about child related ills, but there is a difference between that and just hoardes and hordes of women posting about how they feel trapped and exhausted etc after the endless day to day drudgery and their unsupportive partners/ relationship woes) with exhausted/ fed up women who don’t have any life of their own anymore because their DC have almost sucked the joy out of life and their DP is unsupportive, there’s problems in the relationships/ marriages etc. and then 6 months later, they post to say they’re pregnant again???!
People need to choose their life partners more carefully. If you don't think someone will be a good dad and do their fair share around the house/ with the children so that you still get to be YOU and have time for yourself and an identity of your own once you have children then don't have a child with them. This isn't aimed at you OP, I am just talking in general.
Sorry, I know i'll get shot down for all of the above but it is frustrating and sad to keep seeing these type of posts.