Hi,
You can check on google for such penitential devices. But I encourage you to focus on the Lord rather than on yourself. Spend daily time before a crucifix or better, the tabernacle, reflecting on how He suffered for you. We are all about Him–not ourselves. Forget such extreme measures. They seldom work. It is your attention that He wants–which is why He has allowed you to have the trouble you are having in the first place.
Fr. Vincent Serpa, O.P.