I'd also be inclined to give the furnace a break. I you have an electric oven turn it on and let it warm up for a few minutes. Leave the door open so there is still some heat going into the house, and shut the furnace off for 20 or 30 minutes. Do not leave the oven on unattended; nor for an extended period of time.
Other options in the mean time include shutting doors into rooms you don't use and shutting off the vents and the cold air returns in those rooms. (You may need to put a pillow in front of the C/A return to close it.) I'd also look at getting an electric portable heater- not only to help out in minor emergencies like this, but I also use mine to cut down on my energy costs by only heating the room I'm in- like heating the bedroom when I am done with the rest of the house for the night.
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