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Hi, i`m Richard, a Veterinarian from the UK. Hopefully I can help today.
This is a common presentation for multi cat households and he may be more stressed as you are preparing for the move. Amitryptylline can be very useful in these ases and I would be keen for you to give it a try. There are some other measures you can take to try and minimise Marley`s stress.
Use of plug in pheromone diffusers such as Feliway can help. These should be placed in the area where Marley spends most of his time for best effect. There is also a supplement called Zylkene which can be effective and is best used in combination with Feliway. It is a milk protein extract and works by promoting a feeling of contentment - think a young kitten with a belly full of milk after a good long feed.