Patient: Elevated heart rate that comes and goes everyday (110-130bpm), nausea everyday with dry retching, fatigue, abdominal pain, diarrhoea, headaches, bouts of confusion. Malaise is another symptom. Fever also comes and goes (going up to about 38 degrees Celsius) I’m a 21 y/o female at a healthy weight and height. Current medications are Ritalin and Lexapro – been on these for 6 months (symptoms only started happening 2 weeks ago) blood tests came back normal except for high lymphocytes. What’s wrong?