@CherryMargo it's such a balancing act isn't it; I could make the house cleaner and tidier every evening, but then I have no time to reply to emails/ contact friends/ update MN, which makes me resentful because I have no (virtual) social life and no fun. But then the house gradually gets worse and worse, which makes me stressed. No idea how to improve this apart from when the DC can finally return to school/ spend time with PIL to give me a break...
@GlumyGloomer I have to put everything in the loft to escape the DC's clutches
they're just not old or careful enough not to destroy stuff that catches their eye. I had a sad dream the other night whereby I was out socialising with work friends; it just made me resentful that I can't work at the moment because of them (and DP being useless), the fact that even if I was working I couldn't go out socialising like I used to, and that DP moaned the other day that he hasn't had a night out with friends for six months now. I pointed out that I haven't had one for six years - he tried to point out the error in that statement but there isn't one, because I never do! This is a long-winded way of saying that I understand your resentment about the box room, because for me that's just one part of how having DC has taken over my life in a way I didn't anticipate 
Is there anywhere else you could store your books @SingToTheSky if you think you might use them at some point in the future? A loft, shed, someone else's house...? At least that way it'd get them out of your house and give you space for tidying other stuff into, and you can keep a note of what's where in case you ever do need them. I had to leave loads of photo albums in a friend's shed at one point as I didn't want to bin them (this being in the days before digital photos) but didn't have enough storage as the box was enormous.
@Miaowse every time I clear a surface DP obviously thinks "aha, somewhere to put all my random rubbish on!" so I too would rather have no spare space. Yet if you ask him he will swear that he NEVER clutters anywhere, indeed has no clutter, and in fact Marie Kondo would be put to shame by his minimalism 
Tough day here today, DS1 (borderline ASD at last assessment) has pushed me to the edge. He's suffering from a lack of routine with his schoolwork and activities being off but this afternoon was just moan, whinge, whine, meltdown... and repeat. I ended up ignoring him and leaving him out of the bedtime routine as I was so utterly fed up with him ignoring me and then lashing out when asked to do anything; it eventually led to another meltdown (this one tiredness-related) as he enjoys the bedtime routine, but I was just beyond caring by then. We did make it up and I cuddled him to sleep but I am so sick and tired of his lack of attention span, outbursts, not being able to take both DC out for any length of time by myself etc etc. It's tough enough logistically with twins but when you have one who still acts very much like a toddler with the tantrums, messing around, not listening etc it becomes pretty much impossible... and I don't think anything will get better until he goes back to school, which has made me feel very down.