Two things op:
I know I'm being ultra sensitive, but I find myself on the brink of tears around them & have no idea how best to deal with it without being confrontational
First, you are not being ultra sensitive, they are being ultra rude, which gives you permission to be confrontational frankly.
You don’t have to scream or raise your voice, but straighten yourself up, breathe, look them in the eye, and say something like, “as you can see I am dealing with a challenging situation every day and if the state of our house is not to your liking then you can leave right now” or just say simply “if you don’t like it, feel free to leave”. Keep your eyes on the person you are talking to and let the silence hang in the air after you have spoken too, do not be tempted to fill it.
I was bullied by my in-laws for years, and I was so desperate in my twenties and early thirties for them to like me, but it was only when I had my dc and they started on them that I found the strength to stand up to them, and eventually I had to cut them off.
It was such a terrible source of unhappiness and stress and I couldn’t work out what I was doing wrong and looking back now I am much older, I can clearly see that my mil was the sort of person who simply enjoyed other’s discomfort. She actually respected me more when I challenged her and looking back now I’m much older, I don’t know why I tolerated her behaviour for so long. Probably because part of her manipulation tactics was to lecture on the importance of family; ironically! 😬
Op anyone who behaved in this way in your circumstances is obviously so blatantly out of line that I don’t understand why you are questioning yourself. Probably because you are like me and can’t quite comprehend the shock that anyone would behave like this, let alone those who are part of your family!
You do not need this extra stress. Please feel free to stand up for yourself and protect your own wellbeing and peace.
Second when you say;
I often wonder what the point is in trying to keep on top of it, as DS is so destructive. it’s an indication that you are really struggling mentally was well as practically and no wonder! You also say that you are also very isolated, I think it’s time to acknowledge that you do need help as this isolated life is not sustainable. Please believe me when I say that the best gift you can give your dc is treating yourself decently. I know there is scant help out there but if you are offered respite, please take it.
Sending strength op! You do not have to tolerate this absolutely appalling behaviour. You do not need permission to protect your mental peace when you are doing such an important and hard job.
Lastly, when you say that your dh would respond with a cutting comment, why are you stopping him? It’s not your job to control how he responds and it’s not your job to make everyone feel comfortable at a cost to yourself! You are being too controlling there op! First step is to allow your dh to defend you. He is right to do so. I am very much a family oriented person but it sounds like your dh has reason to react so forcefully.