My daughter is having a problem with vomiting. She can be sitting there and all of a sudden she knows she has to throw up. She gets hot, and clammy and we have made 3 trips to er this year because of this. They give her fluids and medication to stop her from throwing up. She throws up until she starts throwing up blood. We were told it was possibly something to do with vagus nerve-i am wondering, she has been previously diagnosed with fourth nerve palsey which is affecting her vision. Is there any possible link? She isn't suffering from other symtoms like queasy stomach or other flu-like symtoms.