hit like a ton of bricks vs overwhelm

hit like a ton of bricks

verb

To have a sudden and significant impact.

overwhelm

verb

To cause to surround, to cover.
To overpower emotionally.
To engulf, surge over and submerge.
To overpower, crush.

noun

The state or condition of being overwhelmed.

How often have the words hit like a ton of bricks and overwhelm occurred in a corpus of books? (source: Google Ngram Viewer )