Are you able to afford some sort of video-recording device, or at least audio (but video would be best) that you can set up in your room, hidden, to run for the night? Something cheaper but that'll work like from Walmart or something? Or can you get your hands on a recording device some other way, that can roll throughout the night?

Second-guessing will shred your sanity quickly, and so will lack of sleep. IMO it's time to get evidence, not only for your own sanity but also that can be taken to the police as evidence to press charges.

It is good to talk about it, but you also need to DO something about it. You must stand up for yourself, get hard evidence and fight for justice. It is very rare for an abuser to only ever have one victim, there are usually several throughout an abuser's life. Not only do you need to protect yourself, but you must stop whoever is doing this, for the sake of other victims and would-be victims, as well.

If you do not suffer with a paranoia disorder, then chances are your gut feelings are right. That is what gut feelings are for in life. But you must get hard evidence to guarantee your victory against the perpetrator(s).