The tooth brush or the tooth past is irritating the gag reflex. Many people do actually gag or vomit when this happens and others do not.
motion sickness
You have head aches, cramps, vomiting, have a stomach ache, feel the blood flowing,
you feel better because you have let it all out
Vomiting bitter fluid in the morning, especially while brushing teeth, may indicate the presence of bile, which can occur when the stomach is empty. This may be due to issues such as acid reflux, gastritis, or an empty stomach after a night’s sleep. If this happens frequently, it’s important to consult a healthcare professional to rule out any underlying conditions.
Turn off the water while brushing your teeth until you are ready to rinse.
Like vomiting air.
If you feel like vomiting after the last day of you period, you may just have a virus. There should be no reason to vomit just over your period.
Sometimes you feel stressed or overwhelmed OR These may be signs of pregnancy.
i honestly don't think anything is helpful during vomiting, unless u are vomiting because u are sick. after vomiting during sickness sometimes it can make u feel well again!
Tooth brushing
It can be depending which way you do it; the more movement you do the more exercise you are completing; here is a link for a SUPER exercise routine while brushing your teeth: http://www.ehow.com/how_4937759_exercise-brushing-teeth.html
yes it will make you feel better.