Elizablue, the man entering with a gun and the naked woman in the next room screaming are the answers for you. They're metaphorical answers, but they're answers nonetheless. Essentially, throw an extra conflict into the story and let it work itself out.
Also, if you're losing the magic, then you're on the right track. Every writer hits a difficult part in the middle (although it's worse for some than others) when the story seems to be losing its way.
To help combat this (aside from the man with the gun), jot a few notes about your characters: What do they want at this point in the story? What's preventing them from getting it? What resources are available to them? What are they
not willing to do in pursuit of their goal?
Answering these questions should give you an idea what the protagonists (and antagonists, and supporting characters) want to do in the future.
Good luck.