Frustrated With 2-year Old Job

I am extremely frustrated, because I've been working as an admin assistant with a technology company for going on 2 years now, and the company has restructured, had budget cuts, and as a result my job description has changed without my permission, nor without any involvement of HR. The big boss's secretary left and he decided not to rehire for this position but instead to add it to my job description, and furthermore to do all this without telling me until I had to bring it up because I was having trouble completing my workload and that of his secretary's in a timely manner. After I knew for sure they weren't going to rehire for the secretary position,  I asked for a small raise due to the added responsibilities and it was refused due to budget cuts. I later apologized for turning in 1-2 projects late to him, and explained that I was still figuring out how to balance the workload and he told me there was no excuse for my untimeliness and to "figure out a way to get it all done." My real supervisor who is not the same guy has been pushing my admin projects off on other workers, which helps me out, but this makes me feel guilty, and to be honest, I never took this job to be a secretary, and I'm upset about that.

I'm frustrated and want to leave, but I know that I'll end up in another dead-end, boring office job, which is my best bet as a liberal arts major. I'm 4 years out of college, and I want to go back to school for a technology degree instead, but I can't afford to right now. It's depressing. I wish I had a quick solution to get back into school and pay off debts right now.
INTP INTP
26-30
Jul 14, 2010