There's a lot going on, but the answer is simple... and you won't like it. Let the dream happen fully. Don't try to wake up, or fight, or run. Let it take you, completely. It won't be easy. Rest assured that you cannot die from a dream, even when you die in the dream. I've died over and over in my dreams and I'm still here.
Being trapped in your dreams isn't fun. It's terrifying. It's also essential sometimes. If you still aren't getting relief and it's that much torture, ask your pdoc about prazosin. It takes away nightmares.