Well it is really good that you are undergoing treatment for your condition.
Kindly visit a Clinical Psychologist in order to start with therapy sessions.
Combination of medication and therapy works well for your condition.
Inability to concentrate can also be due to Depression.
Next Steps
Consult a Clinical Psychologist for detailed evaluation and therapy sessions. All the best.
Health Tips
The average attention span of an individual is not more than 20-30 minutes. After that he is bound to get distracted. Identify your attention span.