question: Hello doctor, I am a 31 year old male, married for 2 years now. My height is 178 cm and weight is 72 kg. I am not suffering with any medical conditions. I am working in a MNC. I do not have any work related stress as such. My problem is that I feel tired most of the time. I am also prone to getting cold frequently, though I do not have any sinus issues. I do not follow any strict diet and I do not skip my meals as well. I do not drink alcohol or smoke. I am not taking any nutritional supplement. I have not had any checkup recently. Though 1 year back, I did a complete body checkup. The results were normal, except for my cholesterol level, which was on a borderline high, 202. I do not get a consistent sleep. My sexual desire is also very low. I had an addiction to masturbation till recently. But, I have reduced it now. I drive my two wheeler for around 40 km a day. When I am back home after work, I do feel very tired and lazy. What could be the reason for this tiredness? How do I overcome this? Do you suggest any vitamin supplements? Should I perform any test? If yes, could you please list out the names of the tests? Thanks in advance.