Hi ,my elderly mother who is 79 years of age is for the last couple of nights has heartburn and soon after vomits ,its been happening for the last 3/4 nights now and I m noticing her liquid vomit is brown ,she ate a chocolate biscuit earlier on this evening ,could it be the biscuit or some thing else ,she sometimes suffer from constipation ,but not every day and when she does I give her movical ,so what is the cause of her vomiting doctor ,regards antoinette