cyclic vomiting syndrome
"After vomiting for 3-4 days solid, every 4/5 weeks for 6/7 months (starting at age 45), went to see consultant Doctor.  Underwent brain scan etc. to rule out any other causes to the vomiting, diagnosed as cyclic vomiting syndrome and started 10mg amitriptyline a day.  Cured! No vomiting for 3 months now, brilliant!"