I would say virtually impossible for any sort of significant impact to have occurred in this incident.

My scalp is still sensitive after 2.5 years past my accident, stiff neck muscles can make scalp sensitive as well.

I will admit to being quite sensitive anxiety wise to any contact with my head that is perceived as possibly injurious but I have banged it a few times with no ill results other than the resultant anxiety.

I'm sure you're ok.

Bud