Assumed “additional duties” of a more senior employee in November but it’s getting to be too much.

Last June I was hired on contract for my first job out of college. I had no experience in the field. In November my more senior coworker took an unanticipated sick leave and I assumed their role. But now I’m realizing I may be in over my head and want to go back to my original position, especially due to the fact that I’ve recently discovered the employee who I have been covering for is never returning to work. I am a member of the union but there is no mention of assumption of additional duties in the collective agreement other than that if it’s a higher pay grade I must be properly compensated. I received no training and thought that once the coworker returned they could help with anything that fell through the cracks but now that they are never returning I am realizing that help is not going to arrive. I feel as if I never should have taken on the role as I am under qualified but felt if I could impress my employer by taking on additional duties they may decide to keep me around. That was a ridiculous thought because I have also recently discovered management is considering cutting positions in my department including the one I was originally hired in.

Basically my question is if I’m underperforming in the additional role and/or if I decide to discontinue the additional duties can I be let go? I was never even provided a job description for the additional role and probably wouldn’t have accepted if I had known all the implications.....

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