I've just been on a hiatus from driving since January and just started back up yesterday. I am 30 and have two young kids and it has been terrible not being able to drive them and myself around... I hate relying on people. I was recently prescribed modafinil (Provigil) and it's given me so much more energy and helped my legs not get fatigued! Have you tried it? If just tiredness is the issue it might help!