help!!!mom vomiting after eating pain under bellybutton.........

i need some advise!!!! my mother has been vomiting often after eating and says that it is painful if she puts pressure on belly button area? what could this be? she says she is throwing up green-ish liquid...is this bile? she thinks it is excess stomach acid. she has been taking anti-acids like candy most of her life and i told her to stop!!!! i am very worried....she won't go to doctor, she thinks she is just having some flu issues.....but for over 3 weeks?????????????? Tweet