[Chronic Diarrhea]

I think maybe you should go for more of a first-person point of view. I think the barn and having the Germans is a good idea, because it separates the individual from the war. You could put in some running and breathing effects, and depending on what type of battle you're trying to depict (large-scale warfare, small village, etc...) you could have some artillery, not just one bomb. For the shell shock, you could put in a ringing ears effect, and just nerf all the other noises during that period to almost a muted level.