Relaxing helps a lot, as does finding a position to swallow in which the clicking will not occur. This will help you reduce the amount of worry and attention you give to it. Seeing yourself in the mirror while swallowing and practicing also helps, and amen to Psalm 103:1-5. My sickness has brought me closer to my Lord Jesus. Before, I was lost in sin and forgot about my spiritual life, but now every swallow reminds me of Jesus' call.
Matthew 6:27 Worrying will not solve anything; instead, focus on your faith and trust in God to provide.