I Have A Kight Fluttering Feeling Off And On In

I have a kight fluttering feeling off and on in my chest. No pain, just occasional fluttering. What could this be? I forgot to mention that the fluttering is sort of in my throat also. No general symptoms of a heart problem, however. It started last night, and continued in the morning, until I ate a banana and drank orange juice. It's now late night, and i have no fluttering.