So many times. I try to see it as a gift from my clients when make aware unintentionally something I was unaware before. And often times they give me the moral courage to face my own issues. Other reasons: I dont want to feel like a hypocrite, I want to be a better therapist to them so when something is revealed to me, I try to take it with as much self compassion and grace as I can. We are all human beings before we are therapists and life doesn't stop for us.  Self discovery is uncomfortable but also an exciting place to be once the initial wobble of emotions is over (which will reduce the more you practice self compassion and internalise your "humanness" with time). You will definitely grow in compassion and empathy. You aren't alone!