Could it be an Ulcer?

yes...very possible base on vomitting blood, black stool dizziness and light headedness.......check yourself into the hospital ASAP!! You are losing blood internally as you speak! Your hemoglobin is low and you probably need blood transfusion. more important they need to stop the bleeding. and an endroscope will be done.

Black stool means you are bleeding into your bowels. Could be more than just an ulcer. Emerge !

Sounds like you need to go to the hospital like now!

yeah i agree with some of the other answers and get to the doctor, it could be any number of things all of them extremely bad for your health.

since you just downloaded these symptoms from an internet site, why don't you tell us? go see a doctor if you want a diagnosis

sounds like it to me,, start drinking milk,,and no so much of the hard stuff!

YOU NEED TO GET TO THE DR FAST !!!!!!!! IT'S NOT ULCER

I have them and that is not it

no

no your very sick!!!