Your husband is a Diabetic.
Now he is diagnosed with Hiatal hernia
Hiatal hernia may be the culprit for recurrent vomiting
in your husband.
In hiatal hernia some part of the stomach enters the chest cavity where it does not have the space to expand and accommodate the food which the patient is taking. This causes vomiting.
This is a surgical condition.
Follow the advice if the Gastroenterologist.