Exciting times!

Time and patience are the two words you have to remember, over and over again. You can't expect anybody to get used to the new situation overnight - cats or dogs (or yourself, for that matter). The dogs will be naturally overexcited by their new environment.
In the past I brought a dog into a house full of cats too, and none of the cats were impressed (and neither was the dog to have his movements confined to one room at a time). I really struggled with the feeling of having betrayed the cats at the time, and worrying about having destroyed peace in my household. yes, I was feeing very maean too!
I put in a doggy door and only increased access to the house for the dog very gradually. I did lots of treat feeding on either side of the dog gate - cats got treats for coming close in presence of dog, dog got treats for staying put (sit or down) in the presence of cats, focussing on me not them. Stream of treats would stop for both sides if cats moved away from dog. The dog would only venture outside 'his' room in the house under supervision., treating for focussing on me and not the cats.
It took a month or so for the 3 younger cats to realise that the dog could be annoying but not dangerous, a few months later they were OK together (they now sleep together sometimes). My older cat still can't stand the dog (4 years later) - it took her six months to even consider staying in the same room as the dog for any longer than 2 minutes. But she has now learned to not be terrified of him despite her dislike - they just avoid each other, so that's OK too.
If you are prepared to move slowly, not rushing anybody, and manage all dog/cat meetings closely until everyone is ready, I'm sure you'll get there. Hang on in there!
