dragonfly2,
I find I manage the driving okay but it's when unexpected things come up while trying to carry out my daily schedule that faze me, like losing my shopping list or forgetting where I parked the car. So long as nothing gets in the way of the schedule I laid out for the day, the day can run quite smoothly.
Most of the time now it's about prevention. I'm aware of what can faze me so I try to avoid these things. If one or two things come up sudden like I might feel a little fazed but can usually deal. But if a couple of other things come up that I wasn't expecting there can be a problem.
I've often left my shopping trolley and just left the store. In the past I have called someone like my sister or my daughter. Sometimes just hearing their voice is enough to ground me and get me back on track. If that didn't work I would ask them to come meet me.