The night I left my window open the thermometer showed 32°F in the tent but my leaves faced straight down and curled in to try to keep heat in. I don't have a picture but it looked like it was trying to tuck it's arms in and hug itself. My treatment was to spray water on the leaves to moisten it up and make it easier to return to normal shape and then I turned the heater up to 75. They recovered in an hour. If it were me I'd try to save it but your plants look more severe than mine did.