Adam has just taken a tablet that someone gave him. he feels a rise in blood pressure and heart rate, a tremor in his hands, and a loss of appetite.

If you are asking what Adam is experiencing, Adam would be experiencing a form of anxiety or nervousness.

You did not show us the image of the burger, but i shall try to answer as best i can.  when purchasing food, always consider the ingredients as well as the person who prepared it. consider if they were hygienic people or not, in case the burger was infected with bacteria. no mortal should place an infected burger into their mouth.   

Answeraddiction; i know this to be true: )