Please stop doing this loser's work. Sorry to be blunt, but killing yourself is so not worth it.
I would call him on on it and remind him that he'll go down with you. The government will likely make him pay the grants back. Pointing out how the bully will suffer usually makes them back down.
Hugs! Be safe. Does your campus have a lawyer on staff? When I was in college, we had a lawyer that did pro bono (free) work for students. If it's a big college, they usually do. Anything you say to the lawyer will be confidential. Seek advice before going directly to school administration for help.