Op I really feel for you!
I would agree with pp that there are a few things you can do. Cbt for a start. It'll help you understand and manage your feelings.
Also nightlights or motion sensors nightlights.
At night the darkness can feel very empty and threatening or heavy and oppressive, which is why many people start fearing the paranormal once the sun goes down. Anything you can change in your environment to help it feel warmer and more pleasant will help.
Visualisations are wonderful. There are so many you can do, whether you follow some on youbltube or a podcast or make up your own.
As a protective visualisation you can envisage golden light. Lie comfortably and imagine the light coming up to you from the earth and spreading out to form a sphere around you. You are entirely protected within it. If you find yourself worrying about your loved ones, you can send the light out to them to encircle them too.
Or you could envisage somewhere you feel safe and calm. This might be somewhere from your childhood, a memory of bring among your family, or wrapped in a parents arms. Or it could be your favourite place to walk and feel and Peace.
Or you can picture a beach with the waves lapping at the shore. Feeling the cool wet water under you feet and the breeze brushing your skin. Taste the salt in the air and listen to the gulls calling to each other.
Perhaps you prefer a beautiful ancient oak tree by a stream. It's roots stretch down deep into the earth, anchoring and protecting you. You can draw strength and energy from it as you rest against its bark. Feel the earth, twigs and leaves underneath you. Listen to the rustling in the breeze and the gentle rush and burble of the stream as it passes over stones in its bed. The tree stretches up to the blue sky, with light falling gently down to you between its branches and you feeling warm, safe and protected.
Breathe slowly and deeply, letting your thoughts pass through your mind. Don't hold onto them just acknowledge them and let them go, they're just passing through.
...
If none of these work for you, try a meditation- maybe something like headspace or there are plenty on podcasts or YouTube. If you like music, put something quietly on - classical maybe. Or nature sounds. Lots of options!
I would also look at introducing a calming routine before bed. This might include a way to deal with anything on your mind - making a list of how to tackle what you need to do/address for the next day or week. If that won't help focus on dimming lights, turning down noise and screens, taking a relaxing bath.