Will i get fired if i confront my boss about this?

When I started my job close to a year ago, I started as a Personnel istant for a staffing company. My main job duties were to answer phone, make start packets for new hires, and keep up with the start to finish of these new hires. Background checks, drug screening results etc. Pretty easy. As time went on I became more familiar with Payroll, I helped out here and there and now I basically handle all aspects of Payroll and my original job duties. Since we handle all of our new hires nationally, everything we do is sent out through fed-ex packets. So when we have a rush of 30 new hires beginning in a week, its a lot for me to keep up with. Did they return all their paperwork? Did they take their drug test? Did I send over their client paperwork to their new manager? While that’s going on, recruiters are telling me, HEY, I need 5 packets to go out overnight to these people who need to start next Monday. The phone is ringing. I still have to do Payroll for the 200 people who are currently working for us. The original Payroll Admin is sending out joke emails and videos with all the extra time on her hands since this is such “a learning experience for me”, “im doing such a great job in Payroll”. I love Payroll and I love my other job duties, it is just overwhelming. A recruiter got a promotion to lead recruiter and she is on a Power trip, only a couple of people here know how much work I do , but she tells me I need to do a project for a recruiter because it will take too much time out of his recruiting time. Im speechless because im busy enough as it is. She basically tells me in other words, “tough sh*t, its your project now. She even tells me our manager suggested it was a good idea. This recruiter doesn’t like to do new projects, he doesn’t really follow policy, he is holding on to his job by his past experience as an airplane mechanic which is what we recruit for. Im stuck as far as what to do.. What is unfair is, the so called reason I have to do this is because it is too time consuming for him to do, but all the other recruiter have to do it. It will take time out of his recruiting but is it not okay for time to be taken out of their recruiting? Why is this project being handed over to me? I do not want to do something that 1. I don’t have time for 2. Is not an admin’s responsibility 3. Is not fair to other recruiters that I do his work and everyone does their own. Do I confront my manager? What should I do? Im stuck, I don’t want to seem like im complaining to my manager and get in trouble but I also do not want to be taken advantage of. Please help