Not to be rude or anything but in my opinion is sounds like you're trying to find an excuse for no longer getting A's, but I just don't think ADD is the right excuse for your sudden drop in grades. I've never said "I can't study" I get bored, I get distracted, I talk way too much, I procrastinate, but I CAN study when I am well rested, take my medicine, and tell myself what needs to be done before I can have a break. It's not easy nor is it fun to make sure I am disciplined but I make it work, I adapt, and get good grades despite it all....and I never use ADD as an excuse for not doing something. Your depression diagnosis does sound more accurate to me. It's just my opinion, and really, what do I even know.