How to break a spiritual contract made discarnately? (if possible)

[AnthroHeart]

Can you meditate? That would be a first step I imagine.
If you wish, you can ask Archangel Michael to provide protection with white light from those psychic attacks.
Prayer can also be of aid.

I've been where I was freaking out because of my mental illness and thought I had to kill myself. Meditation helped me the most.
My mom works with archangel Michael when she's healing people.

What's really good though, and I do recommend, is to get some white sage, and burn it in your home.
Let the smoke fill all areas of your home and say "This space belongs to me and my family. Only the light may come here. I banish all negativity from this space."
Be sure to leave a back or front door open while saging your place.
Sage clears out negative energy and leaves a neutral feeling behind. That may provide the relief you need.

I'ma do this too! One question though: Can they use the doggy door?

I think it makes things easier if the door is open. It allows the smoke to go out too. It's not bad, I like sage smoke, but it does get thick.
It doesn't set off my smoke alarms though, which is interesting.