Tell him how sorry you are for letting Satan influence your life. Ask him to throw out anything harmful which may be affecting you. Talk to an older Christian about your experiences. Show them this and ask them to pray with you. Ask for their advice about how to stay close to Jesus.
Witchcraft is very strong in parts of Cornwall.
Covens in North Cornwall are known to include professionals such as teachers and bank managers. Boscastle has a museum of witchcraft. Pray for the Christians who have opened a shop next door as a witness to the light of the Gospel. I once had to beat a hasty retreat with a car load of young people after driving into a coven dancing round a fire at an isolated spot on Bodmin Moor. As I prayed as various tactics over a series of lessons had little effect, the Lord said this is a spiritual thing.