Derealization or something else?

I was on the highway, just driving along and all the sudden I looked around and nothing felt familiar for several minutes, and then I realized where I was, and then went to my sister's work to pick her up.

On the way back home I was driving on the highway where it splits into two different highways, and it was all the sudden unfamiliar again and I was filled with such panic and looked around and knew I should have KNOWN where I was but nothing looked familiar and I felt like I had never been there before, and kept wondering if I had accidently taken the wrong highway because nothing looked familiar although I have driven down that SAME highway hundreds of times and so I kept searching for the exit sign that I knew would be there and it was, and so then I suddenly realized I knew where I was.  Everything just felt like a new memory, like I had NEVER driven down that highway yet I HAD.  It freaked me out.

Has this ever happened to anyone?

I've never experienced derealization like this at all.  The derealization I experienced before was tolerable, but THIS is enough to make me think I'm gonna end up in the psych ward in 2 weeks or less.

Am I going insane or is this just a part of derealization I've never experienced before?

It scared me terribly and I'm afraid to drive now because I don't want to get lost if this happens.  I mean, what if it happens more often and I start to forget everything and I go crazy?

What if I just completely can't remember anything?  Is this early EARLY on-set Alzheimers?  IS this a symptom of schizophrenia? LORD HELP ME!!! HW help me!! I'm scared.

Help!!

Am I going crazy? 

Twiggygal~

since your awareness came back soon, just accept it and keep driving, these memory or perception lapses are common for anxiety sufferers and you arent going mad

you need to relax more when driving, remember to do the deep slow  breathing, relax that death grip on the wheel, practice relaxation and calming methods, avoid over controling the car

it helps to play favourite music or sing along to songs on the car radio