I’ve been in Florida more than 30 years (from Indiana), and I cannot recall a colder and more prolonged cold spell as this one. Really incredible. I can hardly type my hands are so cold! I’m glad I picked all my lemons last week and froze the juice or they would not have made it through this mess. My oranges are a loss, as are the calamondins.
I'm bundled up here in South Central Texas too! Heat running constantly and I even have a tower heater near me that I use off and on, lol. We aren't used to this.
I'm sorry about your plant loss and know how you feel. We've had lots of rain and little sunshine. Gets depressing. Maybe the rain helped protect some plant roots from freezing.