Asking for a friend.

Who fainted. Fell over like a tree, full body weight, backward HARD onto a hardwood floor...head fully impacted the ground. This happened yesterday afternoon. Headache for the most part, and neck pain. I am just curious if this is something one should absolutely always go to the doctor for, or if there are certain symptoms one should look out for that might be a danger?

I've done the normal Googling just wondering if anyone has an additional insight...

Thanks guys, you're my oracle :-)

ETA - Okay, thanks all, I wan't expecting a resounding GO, so that makes it very easy....appreciate it!