I live in New Hampshire, it was -5 where I am last night!
Put a rolled up towel in front of each door, on the floor.
Dress in layers.
Get insulation for under each electrical outlet and light switch on all outside walls. This is very cheap and sold in the hardware store.
Buy foot warmers and hand warmers, inexpensive at any
walmart etc.
Sit on a heating pad for awhile to warm up, and keep a couch blanket nearby.
Wear slippers that cover your whole foot, seriously, this really helps.
Outside, wear a hat and a SCARF. It was 37 today, and I did my chicken chores in jeans/turtleneck with another shirt over that/ a scarf/ work gloves/ and tall work boots. The scarf makes all the difference.
Cover windows with plastic made for the purpose. You can still see through it. I use this over the windows in my henhouse. You can get it at the hardware store.
Keep a tea kettle on and sip hot tea all the time. Not only does the tea warm you up, but if you get dehydrated, you'll feel colder.
Eat a healthy breakfast that causes your engine to get going, like oatmeal. You'll feel warmer.
Buy wool socks. It makes a HUGE difference. A wool sweater over your regular clothes will make you feel very toasty also.
LOTS of blankets on your bed, and maybe even the heating pad if you need it. Many years ago, I lived in a VERY drafty 5 bedroom farm house that had VERY expensive electric heat. I was spending over a grand a month on heat with the thermostat all the way down. At night, it would get down to 40 in my room, and I slept with several blankets, a heating pad and a hat and I was always very warm at night.
It won't cost too much to get yourself set up to be warm. I know what you mean, though, it is so miserable when you get cold and can't get warm. Start with the plastic, outlet insulators, and towels rolled up under the doors. Those will make the greatest impact. Oh and close the flues on the fire places. If you don't have your fireplace going with a fire, the open flue allows all the heat in the room to go up the chimney!
If I think of anything else, I'll let you know.
Blessings,
Aundrea