If it were me, I'd go get checked out. Hitting your head is no joke. If things are fine after that and your neck still bothers you, maybe a chiropractor?

Also, I think my neck went through whiplash of some sorts. So far I don’t have any headaches

You're holding this intense conversation online without issue. I'm thinking you might have a small bruise in the area but head trauma is unlikely. Changes in consciousness, dizziness, excessive sleep would be significant with what you describe here but otherwise it really doesn't seem like too much to worry about. MRI, CAT are both going to expose you to unnecessary radiation so without more injury to document it seems You're OK, just shaken.