Can beside myself be used in a sentence?

Yes, "beside myself" can be used in a sentence. It's an idiom that means "overwhelmed with emotion, often anger or excitement."

Here are a few examples:

* "I was beside myself with joy when I heard the good news."

* "He was beside himself with rage after the accident."

* "She was beside herself with grief after the loss of her pet."

It's important to note that "beside myself" is not a literal phrase. You wouldn't physically be beside yourself! It's a way of saying that you're so emotional that you can barely function normally.