When adrenaline rushes through your body, your blood goes to the places that your body feels need it most. That means that your blood is rushing to your heart, your brain, and possibly various muscles, and to do that it rushes out of your legs and makes them feel more like jelly.
Since acid is a primary cause of ulcers, you want to completely avoid any foods with high acidic content. Among them: alcohol, black and red peppers, chili powder and hot peppers, all of which irritate the stomach lining, and coffee, tea, colas, or chocolate, which can increase the amount of stomach acid.
The first of these is to try to avoid eating spicy food. The sting you feel from spicy food if you have a cut on your finger or mouth can be replicated in your stomach or intestine if you have an ulcer. The second recommendation is to avoid citrus and acidic foods and drinks. Highly acidic orange or lemon juice could irritate the ulcer and cause you pain.