I cannot concentrate on my work or studies. When I am studying my mind gets shifted easily or I will be distracted by myself with some thoughts (good or bad. I had better results in my subjects but now that my concentration powers are reducing causing to have poor marks I had a past history with ADHD and I consulted a psychiatrist. I completed the course of medicines, but now I think I am falling to former condition. So is there anyway I can remedy myself without medicines.