What would be the reason a patient has a feeling best described as a twitching or convulsing feeling in the area just outside of the right rib just below the heart? What test would you order and what diagnosis could be possible? Patient information is below.

The patient is a 5ft tall 17 year old female, weighing about 130 lbs, she was previously overweight at the age of 13 weighing almost 200 lbs but lost weight due to anorexia and has been in and out of episodes of anorexia where she counts calories. The patent has a diagnosis of mental health issues and chronic asthma. She takes daily medications for asthma, depression, anxiety and insomnia. Her family medical history mainly consists of cancer, heart problems and strokes.