Trending @Infosys; NEED URGENT ADVICE!

Been in a new project since a month, problem is firstly it's in a different domain to what I've been hired in/have experience in, it's all ETL/integration and technical stuff. Then it's in general shift and they are making us work 10-11 hrs, from morning till late night constantly almost everyday (No NSA), not even understanding the work since i don't have technical experience at all and it's extremely complex and client keeps giving nonstop work. Initially before offical mapping itself i had requested a release from this project but they refused/didn't do anything,now i don't know what to do my health is severely impacted and i don't have any personal time at all. I don't want to leave the company but it seems that force leaving project will lead to NI. Any advice is appreciated, thanks!