Hi i have severe abdominal pain worse then any period pain ive had before currently on my period & feel like vomitting every tim i sit up or go toilet?

Sounds quite serious: Abdominal pain can be from many things. Stomach acid problems cause pain, as does pancreatitis or gallstones. Appendicitis is always a concern (pain is usually right lower abdomen, worsens over time, with fever coming on). If constipated for a while, stool backing up can cause pain. Abdominal infections can cause pain, nausea, vomiting, and fever. A twisted organ or bowel can cause severe pain.