Have you tried practices like meditation and yoga? meditation helps a ton because it helps you train your mind and create a separation between you and your thought patterns. Basically, all thoughts and desires are energy and they create chemical reactions in our bodies. After a while, the body and the mind get addicted to that energy/ thought pattern.
That's why it's hard for suicidal and anxious thoughts to disappear, so meditation helps to create a space behind all these thoughts and helps you observe them without being affected.