delete middle doubly linked list node

undefinedHey guys i have a seperate delete function and im sure the code is correct however it wont delete the middle node properly it seems its loosing the tail. I have a suspicion that its when its loading the doubly linked list into the middle is causing the problem. Could someone look at my load function and see whether im adding at the middle correctly?

Code:

  current = menu->headCategory;

    /* Find the right category for the item to be inserted */
    while(current != NULL)
    {
         /* If the right category has been found for the item to be
         inserted. */
         if(strcmp(current->categoryID,categoryIDcopy) == 0)
    {
    
    submenuCurrent = current->headItem;

   /* Increase the number of items when an item is added */
   
    current->numItems++;

   /* If nothing exists in the category, add to the head of the
   item list. */

   if(submenuCurrent == NULL)
   {
         submenuCurrent = submenuNode;
         current->headItem = submenuCurrent;
         submenuCurrent->nextItem = NULL;
         submenuCurrent->prevItem = NULL;
   }
   else
   {
         submenuPrevious = NULL;
         /* Find the right position to insert the item. */
         
        while((submenuCurrent != NULL) &&
        strcmp(submenuCurrent->itemName,
        submenuNode->itemName) < 0)
  {
        submenuPrevious = submenuCurrent;
        submenuCurrent->prevItem = submenuPrevious;
        submenuCurrent = submenuCurrent->nextItem;
  }
        /* If inserting at the head of the list. */
        if(submenuCurrent == current->headItem)
       {
           submenuNode->nextItem = submenuCurrent;
           submenuCurrent = submenuNode;
           current->headItem = submenuCurrent;
           submenuNode->prevItem = NULL;
       }
        /* If adding to the end of the list. */
       else if(submenuCurrent == NULL)
      {
           submenuPrevious->nextItem = submenuNode;
           submenuCurrent = submenuNode;
           submenuCurrent->nextItem = NULL;
           submenuNode->prevItem = submenuPrevious;
      }
        /* If adding somewhere in between the list. */
      else
      {
           submenuPrevious->nextItem = submenuNode;
           submenuNode->nextItem = submenuCurrent;
           submenuNode->prevItem = submenuPrevious;
           submenuCurrent->prevItem = submenuNode;

      }
  }
}
          current = current->nextCategory;