Hold up on the directional pad (NOT the anolog stick),then press circle,square,triangle.
A screen should appear.
On that screen hold square a few seconds later AMMO should come up on the screen.When that appears press x.
As Rick get to Ahm Shere and go to the middle of the place.Then press start to pause the game and press up,down,left,R1,R3,Triangle.
The pause screen will go and you should go back to the level and your life bar should go up to full if it already isn't and it should stay there throughout the whole game.......!
Added by: DCB MELB , ID#3283