Dear Welcome to HCM We understand your concerns I went through your problem description. You are cleared of any heart related problems. You had your checked your blood and vitals and all are normal. You visited doctors and they are sure that you are alright. They why worry? Physical tiredness could be due to physical and mental tiredness due to overwork or nutrition deficiency or some internal problems. Having internal problems are ruled out. Eating balanced diet should clear malnourishment and rest can clear mental stress. There is another possible cause is Hypochondriasis. You worry that you may have some internal diseases and are feeling tired about it. I hope you have such a psychological condition. Everyone wants to sit idle and take rest but their duties make them to run for their responsibilities towards life. Even people with severe life thretening diseases run for their day to day activities. You are cleared of any diseases and your are worried............Why? Believe in you and believe in god, for he will take care of you, because you don t have any role in future except doing your best. Then do your best happily. Don t worry. Hope I am able to clear your doubt. Availble for further clarification. Good luck.