I used pt petrified of being home alone. What worked for me was
Watching the same movie every night (it gets boring very quickly! Then I fall asleep!)
Leaving the hallway and kitchen/lounge lights on
Keeping external lights on so I could see outside if I needed too
Knowing the neighbours (this is a good one)
Keeping one of DH's golf clubs next to my bed!
DH was away for a month and I got used to it very quickly. We know our neighbours very well which also makes me feel a lot safer. We have 3 sets of (nosey ) retirees around us, they noticed DH wasn't around and kept an eye on me/the house.
I now relish if DH goes away, I get to watch movies in bed and have the whole bed to myself! Pity my dog barks all night when he's not there, she gets way overprotective and barks at everything!