Symptoms of peptic ulcer are: prolonged abdominal pain, nausea, vomiting, acid reflux, indigestion etc. Black stool is a sign of bleeding ulcer. Sudden unbearable stomach pain can be due to ulcer perforation. Vomiting blood can be found in peptic ulcer but it can be found in other conditions too.
Have you ever had stomach pain before now?
Can you describe that pain: precise location?, is it continuous or intermittent? sharp or dull?; present when hungry or after eating?
Do you abuse alcohol?
How often is the vomiting happens? Is blood always present?