Hey Char~ I always carry a sweatshirt in my car yr round. I can't stand to be cold while in a store or restaurant, etc. While I was in NC, the AC in a restaurant was so cold, I had to step outside into the HEAT. Then, when I went back inside, my body was so confused, that I just shook. I didn't have pain or numbness like you though.
I'm sorry you have had such a rough time of it lately. But, those college sweatshirts are usually cool, so you are now a preppy!! take care of yourself and keep that sweatshirt in the car.