Is this pre exam anxiety?

Every night before my papers, I kinda have this void feeling. It's like I don't feel like doing any study-related stuffs. I don't know whether I study enough. I don't know whether I'm prepared. I don't know what I know. I don't know what I don't know. I don't feel like sleeping. I don't feel like eating. I don't feel like watching shows (even friends). I don't feel like talking. I don't know what I'm thinking. I don't know what I should do next. It seems like engineering has successfully crumbled my already-kinda-low self confidence.

My thoughts are somewhat turbulent now. It's messy.