It may be time to do something a little more active in addition to griddinng the house, try a floor washing.

1. Make a strong infusion of basil, hyssop, and pine needles.
2. strain and add to a bucket or spray bottle of rinse water with vinegar. 1 part infusion, 1 part vinegar, 2 parts water.
3. Cleanse floors and surfaces as needed.

Black Tourmaline is great for absorbing negative energies and stress.
Malachite and pyrite are good for attracting luck and money.
Selenite is a powerful cleanser and Red Selenite is an emotional cleanser.

Best of luck to you

There are different systems for locating the wealth area, sometimes called the money area. One of the easiest to use and most effective ones locates it in the far back left corner of a room, house, or property, relative to the official entry, front door, or primary door to the room. Problems in this area, for example it can be missing, leading to not enough $$, or, as Solari points out, if the bathroom is there, money can drain away. This is just one Feng Shui aspect to check, and as someone who has practiced Feng Shui professionally all over the world for 20 years, calling in a qualified professional, can be invaluable. The fact that there is a long term history of similar problems on the site, almost invariably goes along with one or more classic Feng Shui problems. Often there are remedies, and I have seen situations improve dramatically thousands of times, when an accurate diagnosis was followed by conscious and aware solutions. The three year timing, if it matches with that of previous owners, could indicate how long it takes the energy of the place to overwhelm residents who move in with normal, adequate resources. Also, in a good economy, with plenty of money available, the problem won't manifest as seriously as when the economy goes down.