Maybe you should go to mother's house but on pretense that she would believe. Tell her you've seen someone lurking about your house and would feel more comfortable staying with her. Maybe invite her over to your house so she can see first hand and know what you are going through.
I don't know how you are cleaning your house. When I smudge my house I go through the house blessing every window, door, appliance, ceiling, floor, closet, everything by burning a smudge stick and asking God/Universe/Great Spirit to bless this item(whatever) and not allow anything will an ill intent to come near it or come through it or come into your home. That anything with an ill intent to anyone who lives there or visits there not be allowed to be near there.
It always worked well for me. I used to have alot of activity in my house. Bed shaking, pushing violently down on the end of the bed, bad feelings, talking to me, calling my name, etc...
Everyone please send Birdsister energy. God bless you Birdsister and remove this being from your life now and until it can come to peace with itself and only know you in friendship. God bless you.