Brothel Mass Murder and Agoraphobia

by Stephanie
(USA)

There was a movie in the 80's about a woman with agoraphobia. Her boyfriend talked her into going to a house in the country and things start happening to her.

She later finds out the house used to be a brothel and her mother worked there and when she was a baby,all of the women who worked there were killed by the sheriff and dumped in a lake behind the house. These people are haunting the house.

What was the name of this movie?