I can only assume it's separation anxiety. It's just started this week (though he's never been a good sleeper) - but the worst tonight.
He went to bed early at 6:30 because of a short/early nap (he asked for bed), then up at 8 for 30 min and then again at 9. He's just now falling asleep, I think. But this is only after I climbed into bed with him to cuddle and calm him down. If I tried to leave while he was awake (which we used to be able to do) he got extremely emotional screaming "mummy cuddle!"
I'm sitting on the floor of his room in tears, terrified of another night like this. He's been up for 2+ hrs in the middle of the night all week. I don't actually know why I'm posting. I just feel like I'm losing my mind and absolutely hate that I don't know what I'm supposed to do