Working on a battle system, GUI not updating with newest values...

Here is my battle.js code:

 var currentGUIMethod : Function;//Which GUI we are using
 
 function Start () {
  this.currentGUIMethod = mainMenu;
 }
 
 function Update () {
 
 }
 
 function mainMenu(){
  GUILayout.BeginArea(Rect(Screen.width * 0.25, Screen.height * 0.025, Screen.width * 0.5, Screen.height * 0.95));//Begin GUI Area
  GUILayout.Window (0, Rect (Screen.width * 0.01, Screen.height * 0.69, Screen.width * 0.98, Screen.height * 0.3), Menu, "Main Menu");// Window ID, Dimensions, Function, Title
  GUILayout.EndArea();//End GUI Area
 }
 
 function Menu (){ 
  var player : Player;
  for(player in Game.playerList){ 
  GUILayout.BeginHorizontal();
  GUILayout.BeginVertical ("box");
  if(GUILayout.Button ("Attack")) {
  player.playerHealth = player.playerHealth - player.playerStrength;
  }
  if(GUILayout.Button ("Skills")){
  
  }
  if(GUILayout.Button ("Summon")){
  
  }
  if(GUILayout.Button ("Items")) {
  
  }
  GUILayout.EndVertical ();
  GUILayout.BeginVertical("box");
  
  GUILayout.Label(player.playerName);
  GUILayout.Label((player.playerHealthString)+"/"+(player.playerMaxHealthString));
  GUILayout.Label((player.playerActionPointsString)+"/"+(player.playerMaxActionPointsString));
  }
  // GUILayout.Label(Game.playerCharacter.playerName);
  // GUILayout.Label(Game.playerCharacter.playerPortrait);
  // GUILayout.Label((Game.playerCharacter.playerHealthString)+(Game.playerCharacter.playerMaxHealthString));
  // GUILayout.Label((Game.playerCharacter.playerActionPointsString)+(Game.playerCharacter.playerMaxActionPointsString));
  GUILayout.EndVertical();
  GUILayout.EndHorizontal();
 }
 
 function OnGUI () {
  this.currentGUIMethod();//Draw the current GUI
 }

Here is the script containing the player values:

 static var playerCharacter : Player;
 static var playerList = Array();
 var tempPlayer = Player();
 
 function Awake () {
  createPlayerList();
     DontDestroyOnLoad (transform.gameObject);
 }
 
 function Update () {
 // player = GameObject.Find("Player");
 // playerPos = player.transform.position;
  //Debug.Log(itemList.length); 
  if(playerCharacter.playerHealth <= 0){
  Debug.Log("Game Over");
  }
 }
 
 function createPlayerList (){
  playerCharacter = Player();
  playerCharacter.player = GameObject.Find("Player");
  playerCharacter.playerPortrait = Resources.Load ("Textures/player/portrait", Texture);
  playerCharacter.playerBattleTexture = Resources.Load ("Textures/player/battletexture", Texture);
  playerCharacter.playerName = "Clare";
  playerCharacter.playerHealth = 150;
  playerCharacter.playerMaxHealth = 150;
  playerCharacter.playerActionPoints = 50;
  playerCharacter.playerMaxActionPoints = 50;
  playerCharacter.playerStrength = 5;
  playerCharacter.playerDefense = 6;
  playerCharacter.playerKarma = 0;
  playerCharacter.playerMoney = 500;
  playerCharacter.playerHealthString = playerCharacter.playerHealth.ToString();
  playerCharacter.playerMaxHealthString = playerCharacter.playerMaxHealth.ToString();
  playerCharacter.playerActionPointsString = playerCharacter.playerActionPoints.ToString();
  playerCharacter.playerMaxActionPointsString = playerCharacter.playerMaxActionPoints.ToString();
  playerCharacter.playerKarmaString = playerCharacter.playerKarma.ToString();
  playerCharacter.playerMoneyString = playerCharacter.playerMoney.ToString();
  playerList.Push(playerCharacter);
 }

When I click attack it deals the damage to the playerCharacter, I know this because when the playerCharacter's health reaches 0 the Console prints "Game Over"

What I'm wondering (and cant seem figure out) is why the GUI doesn't update to reflect the player's health everytime?

Can you see what's going wrong?