Awww, I just looked at your picture, what a cutie! My ds2 is 7 months and I know how they can just floor you with a crumpled face.
I don't think he will become aware of being separate yet. I was told it wasn't until they were more like one or even older.
I bet he gets a wee cold or a tooth or something in the next day or two. Teething hurts without any actual teeth to show for it, bummer.