Thanks for writing your query.
First of let me assure you that you should not be afraid of vomitting.
20 mg once a day along with Domperidone
10 mg will give you some relief in your symptoms.
Pain in abdomen can be relieved by taking antispasmodic like Drotaverine
I would suggest that you should get yourself treated for nausea/vomitting after discussing with your doctor.
Also have light meals prepared in hygeinic conditions and avoid skipping a meal.
Drink lots of pure water and maintain adequate hydration.
If the problem persists, get yourself examined clinically.
I hope this is helpful to you.