To fix my broke down car

Couple of years back I bought a nice very used 1999 model Ford car from a man here in town for $1500. I don't drive much, and I have tried to be gentle with it but things eventually wear out. This morning the transmssion broke down and will cost over $1200 to fix. 

(update) After 3 weeks in the shop, The car is still not on the road, but probably will be tomorrow.The cost will be $1200 which is what I have raised so far, but it has cost me an extra $200 in car rentals to get to my classes and other necessities. Just a little more help would be very appreciated.

I am 67 years old and my main income is Social Security, (less than $900 a month) and two night classes I teach for Marshall University. If you can help me get back on the road, I will be very grateful. I am totally on foot right now, so time is of the essence. I live a mile out of town, and I have to walk over the hill to get any supplies.

I spent my prime earning years as a minister and did not accumulate any assets for my "golden years". Also I spent the last 15 years caring for my elderly mother until she died in September 2015. When she died I lost 2/3 of my income and it has been a struggle ever since to get by.