<s>[INST] Hello, Im 15, Male, 160 lbs. I keep feeling my heart stopping for a seconds, then it seems to take forever to "start back up" I know my haerts never really stopping. But this has cost me many nights sleep. Also a few hours ago this happened again, and my nose started bleeding. any help here? or am i just gunna keep bleeding and die? [/INST] Hello! Welcome and thank you for asking on Chat Doctor! I passed carefully through your question and would explain that your symptoms could be related to a cardiac arrhythmia or anxiety. The noise bleeding does not seem to be related to the palpitations. Anyway, I would recommend consulting with your attending physician for a physical exam and some tests: - a resting ECG and cardiac ultrasound- an ambulatory 24-48 hours ECG monitoring to investigate for a cardiac arrhythmia-thyroid hormone levels for thyroid gland dysfunction- complete blood count- coagulation tests - blood electrolytes. If all these tests result normal, you should consider anxiety as the main cause of your symptoms. Hope to have been helpful! Wishing good health,  </s>