Is their anything that can help?

My close friend has a few ghosts in her house, she doesn't know how many. She told me that one night she saw a shadow that was flashing and then she got held down for a few seconds and couldn't break free, but then it suddenly stopped. Other things have happened too, orbs have been seen in photos, lights have been whiched off and her mother and father hear people walking around her bedroom whilst she's in bed but she can't hear it. is this anything to worry about? i know ghosts are real because i saw my nan when i was younger. xxx