55 Year Old Male With No History Of Diabetes, Kidney

55 year old male with no history of diabetes, kidney or lung disease. Experiencing heart palpations for extended periods of time, especially at night. Happening for over a month. Had recent ECG, normal. Had a holitor monitor for 2 weeks awaiting results. Routine colonoscopy last week and no mention of issue by anesthesiologist. Causes an alarming sensation in chest and feeling like I need to cough. Is this something serious?