Welcome to HealthcareMagic.
You must be having what is called Mallory Weiss syndrome
.It is nothing but due to repeated vomiting
there is a tear in mucosa of your stomach lining and so bleeding appears in vomiting.As you say you have Bulimia , you should visit your Gastroenterologist for endoscopy
to rule out Hiatus hernia
which is bulging of stomach into oesophageal area.