I have 2 rubber trees that were left outside overnight during a cold spell in Chicago (low temps for this particular night were 34 degrees). The plants also faced a wet wintry mix (rain/sleet) that night. The plants were brought inside to thaw (placed in bathtub for 2 days). From there, they've been residing next to floor/ceiling windows that get the most sunlight in our apartment. It's been several days and there do not seem to be any sign of improvement (leaves are dark & droopy). One of them has dropped 3-4 leaves. The stems appear very weak (they almost have a hollow quality to them). I've pushed them up to the window for support. The plants are going on 10 years (originated as one but divided a number of years ago). They've always been in such great health. I am desperately trying to save them. Is that anything I can do? Or do I need to accept the grim reality they're gone? Any help is much appreciated! I have limited experience with house plants. Thanks in advance! (I have photos that I am looking to post).