Oh yeah, I feel really happy when I sing. Sometimes I don't even realise when I start singing, I just notice my mood change and I realise it happened as I was singing.
Apart from reducing cortisol, it's also a distraction from my worries and keeps me busy as I try to score songs.
I can totally relate to this. Especially the bit about being distracted.
When you finally add an instrument to it you will be soaked in the moment.