Have you tried praying through your house, demanding by the blood of Jesus and your position as His(Ro 8:15-17) that Satan leave? When I came home after a year away I felt oppression in my house, so I claimed my authority as a child of God and prayed through my house in that way. Haven't felt that feeling of spiritual oppression here, since. Satan can't stand such things, and you can pretty much be sure he'll object by trying to scare you, but he can't stand against a child of God, redeemed by the sacrificial blood of Christ, who rebukes Satan by Christ's Name.
Can't tell you I'm very strong in my faith, and would have a difficult time if I were facing oppression right now. But I'll pray for you.
I think it's great you were able to share that letter.