Hi, there definitely is a problem in sustaining attention and concentration for you. It can be due to many factors important of which to be ruled out are any physical problems like
diabetes, hypertension,
thyroid, nutritional deficiency. Others can be sleep disturbances, mood fluctuations etc.
Next Steps
I would suggest you get an annual package check up done first, they meet a general practitioner. once he clears you then you will need to show to a psychiatrist or a Psychologist