Hi,
Noted the different history about you and your husband.
Recurrent vomiting, feeling better after vomiting indicates one of the following things to be ruled out by Upper GI
Endoscopy, Barium studies or Contrast Enhanced CT scan of abdomen with Enteroclysis.
Intestinal obstruction at the
small intestine or Jejunum by pancreas or so.
Cyclical vomiting.
Severe
gastritis with lax lower esophageal sphincter.
One a correct diagnosis is made the treatment will be specific.
About your retina pigmentosa.
You can decide the dose of
Vitamin A and others by conducting the blood levels to decide the exact dose you have take and also to review regularly, try out under your Doctor's guidance, may help.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. T. Chandrakant, ENT and General Surgeon