Albert Barnes Commentary Psalms 30:2

"O Jehovah my God, I cried unto thee, and thou hast healed me." — Psalms 30:2 (ASV)

O Lord my God, I cried unto thee – In the time of trouble and danger.

And thou hast healed me – You did restore me to health. The language here evidently refers to the fact that he had been sick, and had then been restored to health.