I need a new furnace

Things haven't been going well for me for a while and it just got worse. When I woke up yesterday morning it was 46 degrees in my house. My furnace stopped working. I bareley live pay check to pay check and can't afford the $4,000 it will cost to replace it. I'm also in the Army Reserves and because of the shut down in October I didn't have drill. To make things even better the Army screwed up my pay and I owe money so I won't be receiving any drill pay for the next 4 months. Without help I won't be able to replace it. Please help.