Training your manager!!?

I have been at my company for several years. I could do my job with my eyes closed. My manager recently left for a better position. So happy for her. The only reason I wasn’t able to fill her role was because I don’t have a degree. This rule has recently changed this year. I spent 5 years at this company excelling and learning everything I can so that I could fill her role when she left but nope recent rule change has said that I can’t. But now I’m expected to train my new manager on how to be my manager!! And try to do my job at the same time. This is such BS. No extra compensation. Nothing. I’m so tired of this company. They put entirely too much responsibility on me to receive nothing in return. What you do in my position!?