Nyctophobia, but only in certain places

I’ve had a fear of the dark for as long as I can remember, sometimes it lets off for a few months, but it always comes back. I only feel anxious and scared in my own home, never anywhere else (parking lots, friends’ houses, boyfriend’s house, forests, etc). My only safe spaces are my own bedroom and my bathroom, everywhere else in the house I’m practically running and rushing to get back to my bedroom. It’s become so debilitating. It’s not even anything remotely plausible that my brain thinks will happen, it’s always some paranormal crap that I don’t even truly believe in yet I have a mental image of it every single time. I can’t even go into my kitchen to fill up my water or grab a snack. I can’t tell you the last time I slept in complete darkness at home. I’m so tired of this and even my counseller is at a bit of a loss as to where this fear came from and how we could deal with it.