I know someone had the same situation, he couldn't finish it and

The best way, almost the only way, to find a sick note of your parents, and to request to go back to China for a while, go back to China to rest for 6 months, and come back to finish the research. The guy I knew couldn't graduate, and had a big fight with his Professor. Eventually, found another nice professor, in another university, who took him. He took another extra two years obtained his Dr. degree.  

By the way, I don't know if this is true. 几乎众所周知的大学‘潜规则’是博士导师不希望已经有经验能在实验室独当一面的博士生毕业。 I doubt it. 

Good luck.