There's that old saying, "Trust your instincts."

As for dealing with it; Is he in practice alone? How about mentioning it to his supervisor?

Maybe the confusion is because you should have a third party involved. Someone less likley to blow up at your worries. If you're right he might take some kind of action against you.

How bout asking one of the docs on here, what to do?

I think that's the best answer, third party involvement.