Fear Effect.
I'm f**king well stuck. As anybody who has played the game knows, it doesnt have a conventional health bar, you have a sort of heart monitor that gradually turns red as you take damage. You can't regain health (or turn your bar back to green) until certain points in the game when everything is calm. Basically the game acts like your character's heart is racing which in turn makes you crap your pants about confrontations. Ive stupidly saved while my heart monitor was on red and now when I advance I need to take out a shit load of guys but just a single hit kills me and its f**king impossible. I fear ive f**ked my game by saving where I did and ive got no way of advancing. Damn it!
Im playing on Hard as well, so I get to see the "best" ending.