beside oneself
If you are beside yourself with anger or excitement, you are extremely angry or excited.
He had shouted down the phone at her, beside himself with anxiety.
他在电话里冲她大吼大叫,急得要发狂了。
Something that is beside something else is at the side of it or next to it.
On the table beside an empty plate was a pile of books.
桌上的空碟子旁摆着一摞书。