This is totally my intuitive interpretation, no use of references or sources, so keep that in mind- I might not be "on" with this..but I'll try!

There are a couple symbols here that stand out- one being the church. Are you a member of a church or religious group? What are your feelings about them/it? Because you bolted back to the church, like it was a place of safety to get away from the black bird. That stood out for me.

I also have noticed when we have dreams where we can't yell for help (or speak, in your case) or lose the ability to run, it might be indicative of feeling helpless in some aspect of our waking life. Is there a person you know, or a current situation, that you want to help but have no control over in waking life? Also interesting that you were above everyone, on the roof. Sounds like an objective "point of view," where you are on the outside of a situation looking in (or down).

As for the bird...initially you thought it was a raven, but turns out it was a swan. I'm not going to go look up an animal meaning on the internet, because I've found animals represent different things to different people (for example, sharks/cats often symbolize evil/bad luck in dreams, but to me they are wonderful and I've even had pleasant dreams about riding on the backs of sharks! LOL). Ravens have a tendency to represent darkness and maybe even bad fortune, but your bird wasn't even a raven...I would think that black swans are rare, and perhaps the bird not being what you thought it was is indicative of something or someone fooling you in waking life (or a fear that this might happen?)

Well, I hope that helps. I might be totally off, this was just my opinion Overall theme could be related to spirituality (i.e. the church).