Even if you're puking day and night, it's not hurting the baby.
If you can only tolerate a very limited menu, it's OK to eat those items over and over. Some experts recommend products with ginger, such as ginger cookies, to help with nausea. Another suggestion: Take prenatal vitamins with meals rather than on an empty stomach. And keep your portion sizes small.
The Mayo Clinic Web site recommends that you see a doctor if the vomiting is so severe that you can't keep down water, the vomit contains blood or vomiting causes you to become dizzy and faint.
If you want to try alternative therapies, such as acupuncture, check with your doctor first to be on the safe side.
In general, think of nausea as a good sign. Extensive medical research has shown that women who have morning sickness are less likely to miscarry.