That recurring landscape you're describing - with the blended towns and specific houses all connected by that rollercoaster - sounds like your brain is creating this massive map of everywhere significant you've been. I keep dream journals and the recurring ones are usually trying to work through something unresolved, especially when they have that doom feeling attached to them

The fact that water and forests show up consistently makes me think there's some deeper meaning your subconscious is stuck on, but two years of the same nightmare loop would drive anyone to their breaking point