The negative effects of combat were nightmares and I'd get jumpy around certain noises and stuff but you'd have that after a car accident or a bad divorce. Life's filled with trauma. You don't need to go to war to find it it's going to find you. We all deal with it and the effects go away after awhile. At least they did for me.
Overall the anarchy was the most creative of all periods of Japanese culture for in it there appeared the greatest landscape painting the culmination of the skill of landscape gardening and the arts of flower arrangement and the No drama.