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.
Citrus fruits also contain a high level of acid and may cause reflux symptoms. Fruits with less acidity include bananas and melons. Unless you have an active stomach ulcer, you can generally eat pineapple without experiencing any harmful side effects. Whether pineapple affects acid reflux depends on the person.