Demons, please help me.

Since we know it's a demon, we should start from centering. Don't move your heart, and don't be afraid. Every day, I return a Tibetan sutra to aggrieved creditors. May they be happy from their sufferings. It takes some time to calm down, and the most important thing is to recite the Tibetan scriptures every day. Stick to it, there is joy in suffering. Self-confidence will have a real effect. When you are not chanting, recite the Buddha and leave the chanting machine on. After about 24 hours, you will have concentration. May you be happy soon.