Do not call your local animal control. These people are not experts on dogs or animals in general let alone behaviour. They just have the fun job of collecting problem animals. Find a rottweiler rescue group in your area. These people specialize in the breed, and are used to seeing personality quirks of every type. They can help you out.
Sounds to me like a vet and/or a behaviourist would be where you'll end up, but there's a lot more info we would need to be able to say for sure.
No dog suddenly transforms into a killer except in the case of a mental illness. Brain tumors can cause odd behaviour changes or aggression for instance. I wouldn't wait for things to get worse.
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