Hi scifigal. I try to avoid driving if I'm having a really bad day. If that's not possible I'll go a little slower and maybe have a caffeinated drink before hand or some cherry juice to wake myself up a bit .I really hope the others have some good advice for you I know how scary it can be. I'll often forget directions and end up taking much longer to get places than needed. You should discuss this with your doctor if you can and remember if you can't do something because of your fibro there's nothing more important than your safety so things can wait until you feel a little better