I live in a terraced house and some of the creaks are caused by the neighbours - back door closing, walking up stairs, ceiling creaking next door, all sound as though it's my house. On the other hand I would only have to scream or bang on the wall if I had burglars and the neighbour's would hear me. If I come home after dark I have to go upstairs and check all rooms and under beds!
I think movement activated lights front and back are good, but must be properly set so that they don't come on for hedgehogs or a fox. A beware of the dog sign on the gate, a dogbowl and lead in the kitchen, a man's coat and shoes etc can all be a deterrant either when having workmen in or to a burglar. I also have radio 4 on all night.
The other thing to consider is whether your diet contains all the essential vitamins - eg low levels of B and D, and magnesium, can cause anxiety. You could also try taking St John's Wort which is very common amongst older people in some European countries, but it can affect other medicines so check it out on the Internet/with your doctor first.
In spite of everything, I have occasionally left my back door unlocked when I have felt ill, so that someone can get in without breaking the door down, and find me if I die!