bad car with 3 years left of payments...what to do???

I have a 2000 cadillac deville I bought 2 years ago for 10,000. I got a loan from capitalone auto finance at 10%. I lost my job about 5 months ago and just found another now....just in time for my car to break beyond repair. Long story short, it needs a new engine that just wouldnt be worth putting in. The car is now worth about $6,000 and that is about what I owe on it. Hers the catch....since being unemployed, I have maxed most of my credit cards and now I dont have any decent credit. I also am responsibe for half of a fata mortgage payment. With this car and about 15,000 in credit debt......would I be better off just having the car repoed and filling bankruptcy for everything? I feel like, with my income, I will never get out of this hole. I also go to school full time...what to do??