The cost of replacement of the automatic transmission of a '99 honda accord

I had my transmission replaced four years ago and it cost me $2000. It went TWO WEEKS AFTER MY WARRANTY EXPIRED. My mechanic told me that the Accord transmissions go bad after about ten years. Now my subframe is rusted and my car didnt pass inspection. A new subframe would cost $900, in addition I need new rear brakes and rotors. The repairs would cost $2000 which is all the car is worth! Im screwed!