Sounds like you’ve spiralled in anxiety op. You are not alone. This was me about 10 years ago. Just existing because I had to because of the kids. I was completely overwhelmed and miserable, everything was utterly joyless. Then I felt guilty on top of that as I wasn’t enjoying my children and making the most out of everything.
Firstly, see your GP if you haven’t already. I was prescribed citalapram which really took the edge of things, shortly after taking them I felt less overwhelmed and a bit more in control, I could see a bit more clarity. If you don’t want to take meds you need to find a way to relax. Look into meditation and relaxing techniques. There are quite a few apps.
Secondly try and prioritise what you’d like to address first, it may be feeling more organised, working on your relationship etc. Hopefully you will feel a bit more able to rationalise and think more clearly.
Thirdly, you need to try and care less. I don’t mean about the important things, I mean about everyday annoyances. No milk in the fridge- ah well it’s not the end of the world, no clean socks, wear the same pair, no-one will know. You get what I mean, minor things can tip you over the edge. This comes with time.
Finally, and this maybe should have been the most important one. You must take care of yourself. You matter. Make time for what matters to you. Listen to a podcast in a relaxing bath, read a book, meet a friend for coffee etc.
I remember absolutely hating everyone and everything. In my experience it was sheer frustration of having to conform to be the perfect parent / wife / colleague etc. Putting myself under huge pressure to be seen as someone who was totally in control, spotless house, kid’s homework never late etc.
You will get there and over time you will learn to love yourself again. I’m now a very happy person. My life is far from perfect, but that’s ok because I’m happy with it. My marriage is happy, my children are happy. I no longer feel overwhelmed, I’ve learned to say ‘no’ (politely), I feel completely in control. I’ve learned to shrug on the chaotic or challenging days and immediately move on. It’s extremely liberating!
good luck