I lived in South Florida for a couple of years. The Fort Lauderdale area. The thing about Florida is the houses are not built for cold weather. I remember in our house we only had a little wall heater in the bathroom and several other rooms. They do not sell heavy jackets and winter clothes in Florida. So when it gets cold down there, people REALLY ARE cold. That's what people up North don't understand about it. We had a really bad cold snap when I was living down there. I remember one day it was colder in Miami than in Juneau, Alaska. If I remember correctly, Miami was 34 F and Juneau was 38 or 39 F. Totally weird. And we were FREEZING.
Stay warm Fiona, and keep the water bottles filled with hot water. Hopefully this cold spell will end soon.