Difficulty setting script on gameObject from another script.

Greetings all

I have a bug in my game that I hope I can be assisted with.

I have a game object ( my player) and an objects that supposed to stun my player when they collide.( cant move or job) Please see my script below.

 public class FallingObjectControl : MonoBehaviour
 {
 //Get the Character
 public GameObject playerObject;

 public Rigidbody2D _rigidbody;
 private bool Stunned;
 public float StunnedFor = 5.0f;

 private CharacterHorizontalMovement mainChar;
 private bool AbilityPerScript;
 // Use this for initialization
 void Start()
 {
 }

 void FixedUpdate()
 {
     if (Stunned)
     {
         Debug.Log("Stunned");
         //  HandleStun();
         StartCoroutine(HandleStun());

     }
 }


 // Update is called once per frame
 void Update()
 {



 }

 private IEnumerator HandleStun()
 {
     //Stunned, De activate movement

     playerObject.GetComponent<CharacterHorizontalMovement>().AbilityPermitted = false;
     playerObject.GetComponent<CharacterJump>().AbilityPermitted = false;
     // CharacterHorizontalMovement moveScript = GetComponent<CharacterHorizontalMovement>();
     //  CharacterJump jumpScript = GetComponent<CharacterJump>();

     //  jumpScript.AbilityPermitted = false;
     // moveScript.AbilityPermitted = false;

     // _rigidbody.velocity = new Vector3(0, 0, 0);
     // Vector3 vel = _rigidbody.velocity;
     // vel.z = 0f;
     // _rigidbody.velocity = vel;


     // GameObject.Find("spine-space-cat").SetActive(false);
     // this.gameObject.GetComponent<BoxCollider2D>().enabled = (false);
     // GameObject.Find("spine-space-cat");

     //   if (GameObject.GetComponent <CharacterHorizontalMovement>().WalkSpeed)

     //    if (GameObject.Find("PlayerSpaceship").GetComponent<SpaceshipMovement>().dead == true)



     //Wait for 5 seconds then activate controls
     yield return new WaitForSeconds(StunnedFor);

     playerObject.GetComponent<CharacterHorizontalMovement>().AbilityPermitted = true;
     playerObject.GetComponent<CharacterJump>().AbilityPermitted = true;
     Stunned = false;
     Debug.Log("Start Moving");
     //  jumpScript.AbilityPermitted = true;
     //  moveScript.AbilityPermitted = true;
     Stunned = false;
     //  moveScript.AbilityPermitted = true;
     //  GameObject.Find("Arrows").SetActive(true);
     //  GameObject.Find("ButtonA").SetActive(true);
 }

 void OnTriggerEnter2D(Collider2D col)
 {


     if (col.gameObject.name == "spine-space-cat")
     {
         Debug.Log("Collided with Character FallingObjectcontrol");
         Stunned = true;

     }

 }

}

Now when the item touches my character, the debug log shows as it should, however stunned wasnt getting set to true in the inspector so I changed it to private. Nevertheless, I believe the fixed update is called because "Stunned" is shown in the log. I then attempt to call the coroutine to stun my player for 5 seconds. CharacterHorizontalMovement and CharacterJump is both a script on my player, however, I am unable to set their ability permitted to false even if my code flow seems correct. Interestingly, when I stop my game AbilityPermitted for Characterjump is most times disabled.

So I unsure what I am doing wrong, appreciate if anyone could assist.