Just wanted to send hugs your way. I have no expert advice except lots and lots of love, which u have anyway.
I'm on the site looking for solace myself as I had tough day homeschooling my 2e kid (CAPD, shades of dysgraphia, all related to poor bilateral integration). Need to chill so it doesn't spill over to the next.
About organization- it's been highlighted to me that this is eventually an issue, so good on you that you're focusing on it now. I haven't tried anything much yet as DS8 is suddenly doing well with writing (a month into homeschooling, he started wanting to record all observations). But I am getting him to think of mind maps and how it connects to the central theme. On a daily life basis, I'm also implementing a lot of order in the house, his work room and in practical habits. I keep reminding him about completing cycles, eg, when he leaves a room, to switch off the electricals as part of completing a cycle. Or to leave the plates in the sink etc. He's a big picture person, so helping him to see how everything fits into the fabric of life as part of a greater, unseen "organization" will hopefully filter into his subconsciousness for all other things.
Good luck till 3pm!