Who else realized that the feeling they got from the "holy spirit" as a Christian is actually something else?

I remembered praying so hard at night and feeling this inner calm and sanctum, like absolutely nothing could ever harm me and God loved me so much and blah blah blah. I umed it was the holy spirit, the same one that turned on whenever I felt like I was doing the "right" thing in someone else's eyes. But you know what's weird? I got the EXACT same calm feeling when I chose to renounce my faith, and an overwhelming feeling of calm when I was officially separated from my congregation. I haven't lost that feeling since. It wasn't holy spirit at all, but my own subconscious feeling good about a decision I was making. Who's had a similar experience, where something you took as a sign of God took on a different meaning after you stopped believing?