Yes, I have this sometimes for days in a row.
A butterflies feeling in my chest and stomach. Like I have a nervous excitement, but I'm not excited or nervous about anything! And I also don't feel any other symptoms with it. Just that excitement feeling. It usually goes away after a few days for me.
I've stopped trying to figure out why I get adrenaline released into my body. I've just accepted it happens sometimes and let it be.