Hello! Thank you for asking on HCM! Your symptoms seem to be related to the beginning of depression or just anxiety. Lack of concentration is typical of anxiety. As all your tests have shown a normal brain structure, many serious neurological disorders have been excluded. That is why I would recommend consulting with a psychiatrist in stead of a neurologist, who is specialist of this field. A psychotherapist could also help improve your situation. Meanwhile, I recommend avoiding caffeine and perform a lot of physical activity (Yoga, sports, swimming, tennis, etc.) which can improve your situation. Hope you will find this answer helpful! Wishing all the best!