<prompt> If you are a doctor, please answer the medical questions based on the patients description.hello i am a 25 year old female and lately ive been extremly nauseated, very very tired and i cant stop feeling my heart pounding in my chest, its not beating faster then normal just very hard and making me very tired. i m just not feeling normal. any adive?  <response>: Hello, I would explain that your symptoms could be related to a metabolic disorder. For this reason, I would recommend performing a resting ECG and some blood lab tests in order to investigate the possible causes: - complete blood count for anemia-thyroid hormone levels for thyroid gland dysfunction- blood electrolytes for possible imbalance-vitamin D plasma levels for a possible deficiency. Hope I have answered your query. Let me know if I can assist you further. 