Sounds like the 8mo 'horrors' to me. I think it must be a really complex developmental stage for many children. I think it's different for each child, but it doesn't last.
Natty's unsettled sleep lasted for a couple of months, though some nights she'd give me a break and have a decent sleep. It really didn't seem to make a difference what I did, TBH...
But it is worth trying some different things - more food, exploring how warm or cool the room is, etc. Just so you know you've given it a go
I hope he gives you a lovely sleepy break soon