hallucinating and weird vision, I fell of a horse...

Hi, I fell of a horse yesterday (straight on my back with no protector on) and I also hit my head with the ground quite hard, I got back on and had a bad pain on my back neck and head but it was bearable, I went to a friends party roller skating and my head was pounding and i had a stabbing pain at the back of my head so I went to the bathroom and immediately felt like I was going to faint and I started to hyperventilate and cry so they called an ambulance and I was calmed down and immobilised and had X-rays of my neck and back but none of my head which all came back fine except for my spine where it wasn't lying completely straight but they said it was nothing to be concerned about, so I an home, it's 4:10 in the morning and I have just been hallucinating, my focus seems to be zooming in and out then my vision goes blurry and I have an extremely sore throat. Is this normal? Probably not the sore throat because I always have that after shock, but is hallucinating and weird vision right?