Driving is a common fear for people with anxiety. I struggle with it from time-to-time, especially when in a new environment. Here is how I handle it. Go out driving with someone (like your husband) when traffic is low and now in a non-busy area. Do this regularly. Then go out driving alone in a low traffic area for a brief time with your cell phone so you can call if you get anxious (you probably won't need it but have it handy). Gradually extend the time, distance, and complexity of your driving. You especially want to drive to the school you plan to attend before it starts.
Most important, when you get home, take a moment to give yourself praise for you efforts and successes.
You may
always have issues with this to some degree. That's OK ... everybody is dealing with something.