My dad use to have terrible nightmares of his parents and siblings calling him over to a playground to play. The thing is, it would be his mom,pop, and 2 older brothers (all of whom had passed away). He would wake up mumbling and screaming sometimes, which scared the crap out of everyone in the house. My mom, who had just then became a Christian sought advice from our minister and gave him a simple phrase to call out if he ever had that dream. "Jesus, save me". Granted, it was in Chinese, but you get the point. So one night when he had that dream again, he called out and he said a calm he had never experienced before filled his body. Never had that dream ever again. I think thats when he realized he would live out his life a Christian.
Not explicitly implying you need spiritual help, but just a thought.
If the dream is reoccuring, definitely seek help.
Otherwise, its probably just normal every day stress. Exercise + meditation, perhaps?
EDIT: Did you test if the dream was in fact lucid? Invoke supernatural powers = best test ever (fly rocks!)