Yes, about a year and a half ago I had some mental healing that was unexpected, though very welcome.
A year or more before that happened, I lost a beloved pet and blamed my husband for allowing that to happen. I was very angry with him and held my anger by shutting him out of my life in several ways. I do not recall asking God to help me with this situation, except that I had acknowledged to God that I knew I needed to be kinder to my husband.
The healing experience happened in the middle of the night one night while I was half asleep. All of a sudden I felt a sensation of just letting all the anger go and a peacefulness taking its place. I really don't believe that I had taken any sustained action (such as prayer or "believing") to cause this. The anger never returned. I do believe this event was God working in my life, just in an unexpected and unrequested way.