What does it mean when you suppress so much emotion and stress it physically hurts and causes violent vomiting ?

Too much stress: If you are having so much stress in your life that this is occurring then you need to seek counseling. Counseling can help you deal with the stressors in life and help you find healthy ways to express your emotions. Suppressing strong emotions can literally make you sick.

Therapy?: Have you yet tried any form of psychotherapy? Typically, the optimal combination of things to treat emotional issues such as depression is medication (which, on your best day, is supposed to take the edge off symptoms) but the real gruntwork takes place in psychotherapist's consulting room.

The symptoms you: mention suggest the need to get a check up w/your doc to rule out medical conditions. Then consider seeing a mental health professional to deal w/what it is your are trying to suppress. You will be happier for it. Peace and good health. If you are in college, you can use your college counselling center.