going back to the part about a lot of stress, I became depressed right after high school because I was out of my NORMAL routine
. Because before i graduated I had the same routine
since I was a child. seems to me, that if everyone that is experiencing the sensation has a load of stress, anxiety, depression, etc. then that might be the source. THE STOMACH GROWLING MAY BE AN UPSET STOMACH DUE TO STRESS, THUS TRIGGERING THE SENSATION.