EXPERIENCED PIANO PLAYERS!!! need answers?

ok so today something really crazy happened. I don't know how to put this without sounding insane. I have been playing for only 2 years now I taught my self how to play by ear not by reading. Although I should probably learn to, well anyway first it was just by watching other people play. I tried remembering the keys and so fourth I went from practicing 10 minutes a day to hours sometime 4 hours straight, like literally nonstop playing Beethoven over and over again. Well today as I was playing moonlight sonata my hands went crazy. My mom was in the other room and I was pressing random key all across the piano and it didn't sound like rubbish but seriously music. She stood at the door and just watched me play because it shocked her too. It was like my hands had a mind of there own and they were crawling all over the place it was all my feelings, anxiety, and pion was pouring onto the keyboard creating a natural high. What was this have you also experienced something like this?