I have more money and no kids, I still relate to your comment.

I burned out basically because I'm stupid and decided to work a demanding full time job while also remodeling my house by myself. Like all renovation jobs, it ended up being bigger than planned (I actually expected it to grow from us discovering something that had to be done during the renovation, I just never expected the thing we found to be as large as it was: we had to redo the whole foundation of our 1840 house, and because a machine wouldn't fit through the doors, we ended up digging out around 16m3 of hard packed dirt by hand and carrying it out of the house, also by hand)

What was supposed to be a kitchen upgrade turned into roughly half our house looking like something out of tomb raider for a year. 8 hours of intellectually demanding office work followed by 8 hours of grueling digging in "the mine" as came to nickname the ground floor really did a number on both me and my wife.

She crashed out first, which left me with no choice but to keep pushing long past what I felt I could handle. Saw a doctor who diagnosed me with burnout and told me to rest for 6 months,I instead held out for another ~6 months until my wife was back on her legs before allowing myself to rest.

The 6 months of sick leave the doctor prescribed wasn't nearly enough.

But hey, my kitchen is fucking gorgeous, so there's that, at least!