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Hello, I'm Dr. Deb and will do my best to answer your question about Feliway.
There actually have been reports of increased aggression after the use of Feliway in certain cats although we don't have a really good explanation for it. As you probably already know, this product contains a natural pheromone which is intended to reduce stress and anxiety with my preference the diffuser rather than the spray.
But, several of my pet owners had to stop using it when their cats displayed the opposite reaction from what we were trying to achieve.
So, your experience isn't that unusual, unfortunately.