Thanks for asking. Along with headache, laziness and weakness, are you having few of the following symptoms too? Low mood, sleeping problem or excessive sleeping, excessive worrying or persistent negative thoughts, staying alone and aloof not feeling like going out, talking to anyone, irritability. If these symptoms are also present then I would strongly advise you to consult a psychiatrist/psychologist. I am considering  depression. Do not worry as a timely consultation and treatment will cure the problem if present. In milder cases counselling sessions itself can solve the problem. If needed, medications are also available. Hope you find this helpful. Welcome for more information and queries. You can contact me directly on practo. Regards Dr Pankaj Borade