My sprite looks like it is haveing a seizure. What am I doing wrong?

Trying to create a 2d Top down random movement. I have the blendtree setup so that it faces the sprite in the right direction. However, I can't get it move right. It just flips back and forth between directions never moving. Unless I use the RidgidBody2d apply force then it just slowly convulses to 0,0.

I guess I wanted it walk in one direction base cardinal direction (no angles) for 3 seconds then change direction.

What Am I doing wrong?

 public float moveSpeed = 0.75f;
 public Animator anim;
 public Rigidbody2D body;
 
 private Vector2 enemyMovement;
 
 
 void Start () {
     anim = GetComponent<Animator> ();
 }
 
 
 void Update () {
     Invoke("randomDirection", 1);
     transform.position = new Vector3(enemyMovement.x,enemyMovement.y,0) * moveSpeed * Time.deltaTime;
     
     //TRIED THIS TOO
     //body.AddForce (enemyMovement);
 }
 
 void randomDirection() {
     switch(Random.Range (0,3)){
         case 0:
             Debug.Log ("Moving enemy Up");
              enemyMovement = new Vector2 (0,1);
             break;
         case 1:
             Debug.Log ("Moving enemy Right");
              enemyMovement = new Vector2 (1,0);
             break;
         case 2: 
             Debug.Log ("Moving enemy Down");
              enemyMovement = new Vector2 (0,-1);
             break;
         case 3:
             Debug.Log ("Moving enemy Left");
              enemyMovement = new Vector2 (-1,0);
             break;
         default:
              enemyMovement = new Vector2 (0,0);
             break;
     }
     anim.SetBool ("Walking", true);
     DefineFacingDirection (enemyMovement);
 
 }