The other day, I wanted to describe my shock regarding the overwhelming HSK6 vocabulary list (~2500 additional words) to my teacher, so I came up with a self-made idiom 词山词海: taking 人山人海 and replacing 人 with 词. I thought it was apt and quite proud of my creation, by my teacher disagreed.
I can't think of an idiomatic way to express this sense of being overwhelmed by vocabulary when learning a language in Chinese. Sure, I could say 词汇太多了, but it doesn't have the sense of being overwhelmed.
Question: Is there an idiomatic way to express being overwhelmed by vocabulary?