Probably not, but your head does not have to bump anything external to incur a TBI.

Whiplash can cause TBI because your brain moves INSIDE your skull. The impact with the skull, especially the boney bit around your eyebrows and nose, can shave off axons. There are people on this very forum wresting PCS as a result of people rear ending their cars at relatively low speed.

However, as the previous poster said, injuries to the neck can be aggravated by shaking. That is more likely to be the source of your current difficulties.