Are you under a doctor's care and/or on meds? Any major changes to your diet and exercise should be discussed with him/her prior to beginning, but there are some simple things you can do to get started.
Bread, chips and water could be why you have the constant nausea/vomiting. Try to incorporate some lean meats, veggies and fruits, along with low/no fat dairy such as milk, yogurt, cheeses, etc...........Whole grains, beans, etc will provide both protein and fiber.