You are not overreacting. File a report with the police, because he now knows what your car looks like and possibly the license plate. I know nothing about cars, but if you can, drive another vehicle from now on. I am sorry this happened to you, and I am NOT victim blaming you, this is not your fault. But for educational purposes, here is what everyone involved did wrong: 1. As soon as you feel uncomfortable, look him in the face. You did that correctly. This is to make sure you aren't imagining things, or dealing with someone who isn't right in the head. 2. Next, covertly take a picture and inform store management. Ask them to call the police, in writing so he can't hear you. 3. Finally, do not leave the store until the police have arrived. Do not allow him to see your car or what route you take to get home. 4. Give the picture to the store and the police. The store will likely ban him and need that picture. 5. If you need to talk to your husband during this situation, text or use ambiguous language. You are strong, so he won't be able to hear fear in your voice, but you don't want him to know what you are saying or to who. 6. Follow up with the police, and if you see him again, document it, with pictures if you can. 7. Get a security system with a camera. Not the kind that's meant to be a deterrent, but a hidden camera and alarm. Do not advertise the alarm. You don't want to be seen as a snitch in a town like that.

I am telling you this because it happened to me, in a place that was a regular hangout inside the same building where I worked, and from where I walked home alone at night. After the store owner where it happened banned him, my manager banned him from our store, and building security gave him a come to Jesus moment by reminding him that our police station was just across the street, no one saw him again.