Attacking an enemy (2D platformer)

What i have currently works OK but its far from where i want it. So when the player presses E they stab with their sword creating a trigger, damaging mobs if they touch it, knocking them back and playing an animation. So far it works but the player can spam E and spawn maybe 3 or 4 triggers doing more damage than they should. I want a combo system where at the end of the stab they can press E again in a small time window and it combos with another swing upwards and same thing again downwards.

Here is my code.

• Sword script is for knockback of the enemy only.

• Monster script just deals with the animation and adjusting health. redflash is an attached animation and hurt is an animation in the animator.

  void OnTriggerStay2D(Collider2D other) {

     if (other.CompareTag ("PhysicalWep")) {
           
           animation.Play("Ghost_RedFlash");
           currentHealth = currentHealth - 1;
           Debug.Log(currentHealth);
           hurt = true;
       }
   }
  
  

• Ok here is the bread and butter, this is attached to the player.

  void Update(){ deeztriggers = GameObject.FindGameObjectsWithTag("PhysicalWep");

      if (grounded){
           if (Input.GetKeyDown (KeyCode.E)) {
  
           StartCoroutine(attack());
  
       }}
   }
  
   IEnumerator attack(){
  
       if (OneHandEquipped){
           attacking = true;
           instantiatedObj = (GameObject) PhotonNetwork.Instantiate(wepTriggerPrefabName, wepPoint.position, wepPoint.rotation, 0);}
       yield return new WaitForSeconds (0.25f);
       Destroy(instantiatedObj, time);
       foreach (GameObject PhysicalWep in deeztriggers){
           Destroy(PhysicalWep);}
       attack2ready = true;
       Debug.Log ("attack2 ready");
       if (attack2ready){
           if(Input.GetKeyDown (KeyCode.E)){
           attackingX2 = true;
           }else attackingX2 = false;}
       yield return new WaitForSeconds (1f);
       attack2ready = false;
       attacking = false;
   }