I never thought I'd say this, but it's time to sell

I did the exact same thing. Worst decision I ever made at the time. Blew through the money and it was gone. Going to school is a sacrifice on you as well. It's not like you are going to Disney World for a year. Graduate school is a lot of hard work and long hours. I would suck it up and keep the car. When stress is getting to you go out and tinker with your car. It will help you get through easier IMO.