When submitting to someone you trust, you can let go of your anxieties.
I have 1 Canadian pain slut slave. He is healed by my BDSM pain sessions. He is traumatized by his parents' physical punishments since childhood. His parents beat him from time to time for his naughty behavior. After that, he feels that parents are like a bomb that can explode at any time. Holding such fear makes him anxious. SM beatings relieve him from anxiety. He sheds happy tears after I whip him hard each time.