Oh, that's awful Terri. Poor kitties, I understand why they're traumatized.
You might try some Feliway diffusers. They are intended to help keep kitties relaxed. I use them when introducing a new cat, construction, or when I had a case if misdirected aggression a couple years ago. It's not a miracle cure, but I certainly noticed a difference. I think the only true cure will be time, but the Feliway may ease the situation a bit.
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Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
Yes, I know I need a new signature pic...someday...