Cleansing your house with a sage stick should take care of any negative energy around you. You can purchase them online as well as at your local metaphysical store. While burning the sage stick you will want to say a prayer to bring positive energy into your home. If this doesn't work you may want to consult a professional who will be able to distinguish what kind of issues you are having and how best to get rid of it.
This sounds more like a geist, and you should get a hold of a spiritualist as soon as you can, and a shaman if you can get one. Have them cleanse your home with you, and make sure that you don't try to do this alone. Do this as soon as you can, this never gets better on it's own. Hope this helps you out.
Get some ghost hunters to check things out