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Anxiety can be accompanied by physical effects such as heart palpitations, fatigue, nausea, chest pain, shortness of breath, stomach aches, or headaches. Physically, the body prepares the organism to deal with a threat. Blood pressure and heart rate are increased, sweating is increased, bloodflow to the major muscle groups is increased, and immune and digestive system functions are inhibited (the fight or flight response). External signs of anxiety may include pale skin, sweating, trembling, and pupillary dilation. Someone suffering from anxiety might also experience it as a sense of dread or panic.
I like the cracker theory... mainly because it's really fun to say "cracker theory", but still.. I've found that I find myself saying "I should've eaten something" and the unbidden image of.. crackers (salt crackers, goldfish crackers, etc.) comes to mind. I'll give that a shot.I don't think I've been stressed because of school for years... Good theory though.
Are you sure that your keyboard is working properly Karen W.? It's just that the first sentence is a bit all over the place. 
Maybe she's using her phone, that'll explain a lot.