I'm 60, disabled and pretty overweight, so quite vulnerable to the ill effects of extreme temperatures like those on the way. One trick I have found to be an absolute life saver is to take some of those paperback book sized freezer blocks and, well, freeze them, wrap one in a cotton tea towel or even a face flannel (dry!), and hold them under each armpit in turn so that they are in contact with the large veins under there (Other large veins are available..!). Once the freezer block begins to melt, replace with another from the freezer and refreeze the first one.
P.S. Make sure whichever cloth you wrap around the block is dry or the moisture will freeze to your skin!