Thanks for the reply Mark!

Is there any way for me to prove to myself that this wasn't a concussion? I'm more certain that this event may have been than I was about past incidents. I was dehydrated when I got hit which I think may have lowered the thershold.

Do you think that anxiety could be solely responsible for dizziness, nausea, and light-headedness/trouble concentrating?

I think that I've also noticed some slight blurriness in one eye from time to time which is another reason I'm thinking concussion.