This was me 2 years ago, a few years younger. Full disclosure I am male. As others have said, it will get better, I promise.
A pet really helps. My dog has been a lifeline. Even knowing she is in the house makes it feel completely different.
The shipping forecast/Radio 4. I sometimes get sleep paralysis and wake up in the middle of the night having had nightmare flashbacks of a death I witnessed at close quarters last year. When you’re trying to get your head straight again in those first few moments after waking up in the dark, panting, drenched in sweat in an empty house, mundane Radio 4 (or world service at night) is a lifesaver. You can feel normality coming back into your body through your ears, horror being replaced by reassuring boredom.
Reading silly stuff online. I watched that haunted oil rig TV show last week on Prime (The Rig season 1), fell asleep on the sofa, and woke up in a state at 2am too scared to get up. Reading a mumsnet thread about farting allowed me to get going again.
Don’t binge watch Happy Valley season 1 in the middle of the night like I did. Did not know it features horrific PTSD flashbacks. Took a long time to climb the stairs to bed after that one.
Reading is excellent. But don’t make the mistake I made of reading Elizabeth Bowen’s “The Demon Lover” at 2am, having misunderstood the title. Spoiler alert: the twist in the last paragraph is so terrifying that you’ll be left hearing the sound of your heart pounding in your ears for minutes afterwards. PG Wodehouse is a much safer bet.
Don’t hang wetsuits up to dry in the shower, unless you remember before going to the bathroom at 2am. Looks like a headless monster has hanged themselves right in front of you, flashing up when you turn the bathroom lights on. Still recovering from that one.
On the topic of bathrooms, make sure your bathroom fan doesn’t malfunction and scream like a banshee. Mine did that once in the middle of the night. Worse than watching Woman in Black.
All of those mishaps aside, I’ve now adjusted so much that I often don’t bother turning on the lights when moving about the house after dark. It is quite big old spooky house too. (My kids are too terrified to go upstairs alone when they are here - the vibes of the building are not good). But I enjoy being here now, even when it is just me.
I hope you manage that adjustment without some of the unlucky mishaps I had! I can now look back and laugh. The tricks and workarounds I’ve developed give me a lot more confidence and reassurance. You’ll be able to too, even if it feels impossible now. Depending on what your previous relationship was like, your home will soon feel like a safe place just because you don’t have to share it. Don’t mess it up and get a new partner! Good luck.