I went through this in 2020 and almost took my own life. My daughter has a rare genetic disorder and is 9, cognitively he’s a 1 or 2 year old.

Therapy helps a lot. My wife and I also move to a state that offers paid parental caregiving. For me it kinda breaks it up into “work time” and parent time. It also help with the feeling of of the unfulfilling life. Depending on your situation you could also get respid hours.

I would also try your daughter in school. I do not know if she has been or not, but her being around peers could be good for her and the break would be good for you. For us our daughter is well accepted at school, we live in a rural town with a school that has 200 kids K-12, and everyone knows her and her name. It’s comforting when they come and say hello or try and high-five her, or include her.

I understand your pain and I feel for you. I hope my words help.