Have you decided what to do yet? I work as a project manager, at an IT firm and so I managed to put some money aside but I was already working when I decided to attend law school. I know it's hard but with a bit of luck everything might turn out OK for you.
In my opinion, ADHD is overrated, but I'm not a doctor so... If you trust yours maybe you should take the medicine. You can't rely on the results of just 2-3 tests, take more tests by yourself and then decide what to do.