<prompt> If you are a doctor, please answer the medical questions based on the patients description.My husband has been experiencing a feeling of indigestionuneasy stomach and then gets chills really bad. He is 63 yrs old 6 4 285 lbswith hypertensioncontrolled, overweight, IBS, borderline diabetic, takes lisinopril. avodart and Vitamin D. These symptoms don t come at any given time, such as after eating or activity. They have occurred even while he is in bed resting or awakens him from sleeping, but there is no rhythm or reason surrounding the symptoms. What do you think this is related to?  <response>: Hello! Welcome and thank you for asking on Chat Doctor! His symptoms could be related to different possible causes coronary artery disease, cardiac arrhythmia, thyroid dysfunction, electrolyte imbalance, IBS, etc.. For this reason, I would recommend consulting with his attending physician for a physical exam and some tests to investigate for the possible causes: - a chest X-ray study and pulmonary function tests- a resting ECG and cardiac ultrasound-complete blood count, PCR, ESR for inflammation- thyroid hormone levels - blood electrolytes- an ambulatory 24-48 hours ECG monitoring would help investigate for possible cardiac arrhythmia. An exercise cardiac stress test would help investigate for possible coronary artery disease, especially when considering his cardio-vascular risk factor hypertension, diabetes, overweight, age. You should discuss with your doctor on the above issues. Hope you will find this answer helpful! Wishing good health, 