Call Southwest and ask them to add it for you. Generally, DIY adding of a TT number to your RR account after-the-fact will *not* add the TT number to existing reservations (and consequently you won't get TSA PRE on existing reservations).
While you had stomach flu symptoms, your doctor most likely prescribed a diet that consisted of bland foods and increased liquids. The BRAT diet is a common acronym used to treat an upset stomach and the stomach flu, according to FamilyDoctor.org. BRAT stands for bananas, rice, applesauce and toast.
A food that can help treat a stomach ulcer is cranberries. Cranberries are rich in flavonoids, nutrients that can reduce the growth of H. pylori, the bacteria responsible for ulcers and accelerate healing. Other foods that contain flavonoids include celery, cranberry juice, onions, garlic and green tea. Avoid any foods that cause stomach discomfort.