Hi, Although some of your fears are anticipatory and not reality as yet, you know yourself better than anyone. If you have a history of struggling with your studies and concentration, you may want to head this off before it gets here. I would seek a second opinion or contact your promary care physician for assistance.
Even, though you don't have a history of addiction, sometimes you can build an emotional addiction to the medications, just because they are very good for symptoms. So just be careful to take only as prescribed and let your phsycians know what you are taking, if you use different doctors.
Good luck in your studies. I wish you well. Gina