For those nightmares Sulphur in 6X, 30X, 6C or 30C potency.
You might find prazosin beneficial.
Or just find out the cause. Certain medications can cause nightmares, anti-depressants, caffeine, etc, but it could be your subconscious trying to deal with a little something that's tweaked it. Possession's always possible but not likely; and then there's the possibility that someone's giving them to you. Make anything angry lately?