When I spoke to him today, he said the murmur was a Grade 2.

Oh, dear.

Has your vet mentioned consulting a cardiologist?

Not yet.... he said that he will check the murmur on our next visit...which is Tuesday, 2/26.

So needless to say I will be worried sick til I find out just how severe it's going to be :(

When I got my Yorkie 2 weeks ago, I was meant to go to a local small store that was family run that did grooming and they bred Yorkies, but on the way there...the shopping center next to the one we were supposed to go into had a large sign saying "PUPPIES", so we assumed it was that store.
We went in, it was called "Puppy Boutique", I saw Henry and I fell in love, and on emotion we signed the papers, got him and went home.
I went home and did my research and then found out after about a few searches, that puppy boutique...used to be known as Wizard of Claws, I panicked, took him to the vet 3 times to have him checked for everything!!!
He's healthy, the only problem was, they lied about his weight, the most important thing is he is healthy!.
Thank god he is though, because after reading what everyone has said about that place, I literally cried at the countless horrible stories I read, and the undercover investigations into the puppy mills they get their puppies from!.
I'm an idiot, but I don't regret it, because Henry is such a sweetie and I adore him. But I will be much more careful next time, I am a newb and this is my first Yorkie, the last dog I had was a toy poodle and I was 11 years old.
So I went and got him on emotion without realizing the dangers.
I know this has nothing to do with your post haha, but it reminded me of what happened with mine.

http://www.cavalierhealth.org/Cardiologists.htm

The link above is a list of Cardiologists just click on your State to find one in your area.
I would call and speak to them, I have had to do this before, I called several while I was dealing with two Cavaliers with heart issues.
Prehaps you can get your vet to speak with them.
I just cannot imagine the vet not referring you to a Cardiologists if he thought it was more than an innocent murmur. Because he obviously realizes you are thinking of taking legal actions and he would not want to be thought of as also being neglectul for not referring you to a Cardiologist.

Deana
Prestigeous yorkies