Have you tried drawing or painting? It doesn't have to be some realistic scene or memory still, it can be symbolic or abstract. Maybe just start mixing colors on a canvas as you bring up those feelings and pieces of experience. I bet a 'mood' will start to emerge, even if a picture doesn't. Maybe a particular shape or form will seem to 'speak' to you, even if you don't know what it says. I don't know that this will help you verbalize the unlanguageable, but any form of expression is a start, right?