GAD , Lack of conc. and focus since 2 yr

Hello respected doctors, I have been facing the issue of Lack of concentration and focus since last 2 yrs. I am doing job but my interest has lost. I am not able to focus or concentration on reading something even for 5 mins. I can feel my heartbeat sensations all over the body. Whenever I do any work lot of thoughts distract my mind I consulted General Physician and get tested blood , urine n other reports.He asked that everything is ok but it may be due to anxiety. I don't have any tension too.But it looks like automatically it is happening. Any conversation or argument with anybody remains in my mind for a lond time. No issue in sleeping but sleep  disturbed after every 2 hours and again goes to sleep in a very short time . I am experiencing a lot of dreams as well. Doing meditation and exercises. I am lean boy and have BMI in range. Can any medication help here. I need help from the doctors available Thankyou very much for giving your valuable time to read my isssue.