sounds like it's your diet or lack of...what you ingested today isn't enough for your system to operate on. mountain dew is full of sugar and caffeine. a doughnut is fats and sugar. try having oatmeal or something that is really nutritious before you go to work. and sometimes meds on an empty stomach will make you very ill.

flu shots have a bad rap...they rarely ever cause a person to become ill. i think it's what is not in your stomach....good luck.