I am glad to hear from you, but sorry that it is not all good news.

How bad is this murmur? Not all heart murmurs are equal. Willow has one and we do nothing and he is fine.

As for Tama........my (non-professional) opinion is behavioral. And probably due to the move. New environment, new people, old people gone, missing his 2 cat siblings........that is a whole lot to deal with at once.