Make object move in the direction is facing when rotated

Hi there!

I've this problem where I manage to add the velocity to the game object. However, once I try to change it's direction (using rotate), the object just keeps the previous momentum, without updating to the current direction.

So, how can I make my object change its vector direction every time I rotate it?

Here's the current code:

 //<---------------movement------------------------------>
 //these are to be replaced through stored variables
 var agility : float = 90.0; //Agility of the craft, soon to be controled through stored variables. In degrees per second.
 var speed : float = 10.0; //Speed of the craft, soon to be controled through stored variables
 
 //frame dependent vars
 var amountToMove : float; //amount of the movement 
 var agilityFrame : float; //amount of rotation
 var frameMulti : float = 20; //controls the movement multiplier (higher values mean the action occurs faster)
 
 //control vars
 var curSpeed : float; //this one checks the object current speed
 var wheelStatus : float; //this one controls the state of the mouse wheel, between 0 and 1;
 //this function controls the ship movement
 function movement() {
  agilityFrame = agility * Time.deltaTime * frameMulti;
  
  //Movement
  //obtain movement variables
  var vert = Input.GetAxis("Vertical") * agilityFrame;
  var horz = Input.GetAxis("Horizontal") * agilityFrame;
  var rot = Input.GetAxis("Rotate") * agilityFrame;
  
  
  //here we rotate the ship
  transform.Rotate(vert,horz,rot);
  
  
  //obtain speed variables
  amountToMove = speed * Time.deltaTime * 20;
  if (wheelStatus < 1 && wheelStatus > -1)
  {
  wheelStatus += Input.GetAxis("ShipSpeed");
  }
  if(wheelStatus > 1)
  {
  wheelStatus = 1;
  }
  if(wheelStatus < -1)
  {
  wheelStatus = -1;
  }
  fwd = wheelStatus *  amountToMove;
  
  
  //give speed to the ship
  
  rigidbody.velocity.z = fwd;
  
  
  
  
  
  //place current velocity into control variable
  curSpeed = rigidbody.velocity.magnitude;
  
  //make sure that current speed isn't bigger that maximum speed or smaller than minimum speed
  if (curSpeed > speed)
  {
  rigidbody.velocity.z = speed;
  
  }
  if (curSpeed < -speed)
  {
  rigidbody.velocity.z = -speed;
  
  }
  
  //reassign current velocity into control variable
  curSpeed = rigidbody.velocity.z;
 
 }

So, how can I make this work?

I appreciate any answers. JPB18