Acute Anxiety will definitely shut you down. Not instantly and without warning though in my experience, Maybe 5 or 10 seconds of thoughts racing, vision and audio fading out, and that's it you wake up again. Not something you want to happen while driving a vehicle. The adrenaline overdose from can make your body hurt and ache for weeks, I used to get pains around the kidneys and stomach so bad it felt like being stabbed.
Anyway like everyone else said see a doctor. Whatever it is your going have to find a way to make it not happen again.
Hug you are not alone.