Can O Soup
Recruit
Maybe there could be some option that you can turn on to have a chance of your character becoming temporarily insane when you take a lot damage at once in battle. This would perhaps double or triple your damage dealt (due to the increased ferocity and fervor of your attacks), but would cause you to only be able to see how much damage you are dealing to other people, and take away your health display and not tell you how much damage you are taking.