If it was the gradual onset, then you drove for years with ME without realizing it. It sound like you realized you were seriously ill about the same time you became unable to drive. I woke up in the morning with the 'nasty flu'. I didn't drive home until the afternoon, so I knew I was sick when I started out. Just young, foolish, and a female who had been conditioned not to be a 'bother' to other people. I also didn't realize just how sick I was when I started the drive. It caught me unaware and with severe brain fog which hindered my judgement. I learned from the experience and made sure it never happened again. Actually, I drove for years without knowing that I had ME, but I knew I had a problem and made changes to my driving to accommodate it. I got a clue that it was probably CFS (as it was called at the time) shortly before I lost my job. I now do not push myself to extreme PEM like I did when trying to maintain my job and am able to drive longer distances than I did then.