Could you give me some other examples of "left my head and heart"?
"Left my head and heart" is not a general expression. In the case of the song here, this sentence refers to being very focused on dancing. You can use the word "head" to mean that you are occupied with doing something and the word "heart" to refer to being passionate about doing something. Ex: My heart is in the game but my head is somewhere else. Ex: Where's your head at? We have to stay focused!